I can now seem to come up with an idea for this party. It is for a 3 year old girls birthday. They are doing pony rides and swimming and want both things incorporated in the cake. Please help if you have pics or ideas. Thanks!

What size & shape is the cake?
For a round: make the top the pool w/kids heads & an inner tube, then have horses (cookies, choco transfer, or colorflo) around the sides.
For a sheet: basically divide it in 1/2 w/pool (could be a thin round cake) on one side and horses in the other part.

make a pool cake and have a horse drinking over the side of the pool. or to be funny, make a pool cake and have horses in the pool playing instead of kids.