There is indoor and outdoor seating at White Water. When we ate there a few weeks ago, there were very few people around. We almost had the place to ourselves!
They have wonderful chicken nachos! Our kids ordered fruit plates, which were great after a day in the sun. They have sandwiches, ice cream bars, a grill menu, all kinds of drinks (ds had something that looked like a 7-11 slurpee, but it was apple juice. It was really good!)
White Water is located in the Grand Californian. If you enter from Downtown Disney, hang a left and walk through the lobby and out the doors. Walk past Storyteller's on your left, and follow the sidewalk as it turns to the right. WW will be on your left (the GC pool will be on your right).