There's sub-forums over at the Dis.
http://disboards.com/forumdisplay.php?f=8
(sorry if I'm not supposed to link it)
We went a couple of years ago. The first day we went, we didn't really like it. We did however, get the "bounce back" they were offering added to our ticket. Went back a second day, later in the day. Everyone seemed to be leaving. It was GREAT. We had a fantastic time!!! The shows are fantastic. Try to catch as many as you can (all if possible!) The Pet's Ahoy one, as well as the Sea Lion show would be great for a 4 year old. Cute and funny! Shamu of course is fantastic.
The first day was when we did the rides, and didn't really enjoy it. I wished we just did the shows on day 1!!
When you get there, look at the guide map. See what time they are letting guests feed the dolphins. Be sure to show up early, and get in line. They do sell out of the fish. That was a big hit with our group.
Have fun!