Water - represents your subconscious, your emotions, and your accumulated life experiences, and the flow of 'feeling' energy. It is also a symbol of new life, refreshment, vigor, energy, cleansing, emotional stirrings, fertility, growth, and creative potential.

Pool - For many people swimming pools are associated with summer fun, vacations, rest, and relaxation. Interpret your dream based on its content and see if any these positive feelings are being conveyed to you. All bodies of water represent our emotions and unconscious. The manner in which they are presented depends on the dreamer and on the details of the dream.

Fence - A fence has two meanings: an obstacle or protection. It is very important to know if the fence is blocking your path or surrounding a property. If you are standing in front of a fence, you need to put some effort in order to overcome an obstacle.
It may be symbols of personal separation in a negative sense or protection in a positive one. These meanings are often derived specifically from whom the fence is separating us from. If you can discern a feeling about what may happen if the fence were crossed (would it be better or worse), that may tell the role the fence is playing in the dream.
Fences can also be a source of boundary. This is true if there is a sense that the fence cannot be crossed. Examine the boundaries of your life in relation to other characters in your dream. Perhaps you want to change those boundaries and move a relationship in a new direction. If you are alone at your fence, perhaps you need to protect yourself from others more, or are already doing so excessively.

Mobile Home/Trailer - This would have the same representation as a house, but on a more temporary basis.
House - A house usually always represents you, or rather 'the self'...your body and the attributes of your personality.
They symbolize your emotional and psychological 'self'. All of your experiences, stages of development, and parts of your conscious and subconscious life may be represented by that house. The house may be representing issues concerning a particular dilemma in your life, or it may be more general and comprehensive.

Large crowd, or group of people - suggests an enormous involvement you have in a current issue. Also, your relationship, or feelings, about the social environment you live in.

Dragon - This large, mystical creature may represent large and mystical forces inside of you. In the far East it is believed that the dragons are spiritual creatures that navigate through the air and through the sky. In the West, dragons are considered to be dangerous creatures that need to be destroyed. As far as dream symbols go, the dragon may represent the enormous power in your subconscious. It could symbolize repressed unconscious material, including fear. However, the dragon in a dream is generally a positive symbol. It may represent a period of time when you will confront your fears and empower yourself to effectively cope with negative emotions, extreme materialism, and be able to obtain greater inner and outer freedom.

That you are trying to rescue, or save the others, suggests that you likely see yourself as a leader, shepherd, parent, or role model to others. Who, or what you rescue, what you rescue them, or it from, and how you did it, often reveals how you see yourself within a particular network of relationships.

Snakes - represent many different things, but usually the 'life-process'. If we think of a person's life from conception to death, we see a flowing, moving event. The snake depicts the force of energy behind that movement and purpose that leads us to both, growth and death... along with the passionate emotions and urges, that drive us so powerfully. So, in some dreams, the snake represents our sexuality, and vitality, throughout our life. In other dreams, the snake can represent creative, or poisonous, energy of our thoughts and emotions.
In the destructive aspect, the snake represents the temptations, poisonous thoughts, and negative emotions that can destroy us.
In the positive aspect, the snake represents a sharp awareness of the world around you, as well as a renewal of life and opportunities.
Because our life-energy flows into thinking and emotions, we are in this way directing the creative force of life. Directing it negatively, has the power to bring illness, or death....for we are dealing with the power of life and death itself.
The opposite is true as well. The power of life and death can be directed creatively. In this way, the snake is seen in it's healing role in dreams. In ancient times, it was shown in the form of the staff with two snakes coiling up it. The caduceus is still used today as a symbol of the medical profession.
If none of these snakes made an attack, or bit you, suggests the more positive aspects of the snake symbolism. That you are starting out life anew, and you feel there are many opportunities open to you.

Yellow - a happy and encouraging color. But it can easily turn into unpleasantness. It is the color of intuition, premonition, and perceptions.
Warm yellow is the color of the radiant energy of the sun; it is a symbol of optimism, joy and spirit.
An unpleasant shade of yellow stands for irritation, envy, extroversion, extreme motivation and activity.

Black - the color of the subconscious, of sinking into the darkness, or mourning. Black is masculine; it is the color of night. Black stands for limitation, hidden things, despair, depression, things that are considered 'taboo', conservatism, old age, melancholy and sacrifice(the giving up of things to make you, or someone else happy), your shadow (an aspect of your personality that is hidden, unknown and/or repressed within your subconscious mind).

Peace symbol - represents exactly that.....peace.
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Have you been dealing with an emotional issue recently?
Have you been feeling the need for more peace in your waking life?
Do you feel shut off, or separated from others?...Or a desire to have more time to yourself?
Do you feel as though you have given up something of yourself to make someone else happy?
Are you trying to make your own way, or trying to set an example for others, and you are finding it rather difficult?
Have you been feeling tempted in one way or another?

Hope this gives you some insight, best of luck!