Pole fishing at Riverside was $8 this summer for each pole. You get the pole, a tub of wiggly worms and a towel. There's a fountain/sink thing on the little deck as your hands get wormy. The pond is small and you can see the little fish. We had good luck and each child caught and released a few fish. The hours were 9 - 3 daily or something like that -- you can call and find out when you are there. I remember there was a group rate, too -- poles for the whole family for maybe $20? If you have a big family it was a savings. I think the rental period was a half hour, which was enough.
Have fun! My favorite part of the whole thing was walking a few steps down to the pool-bar when we were done --- PINA COLADA time!