We've also eaten at Mango Joe's - it's right by the Wild Arctic. Definitely time your arrival for during, not just after, one of the Shamu shows! Having said that there is a new shopping/dining area over the other side of the lake which may be worth investigating.
When we've been there, there have been at least 2 main Shamu shows, plus a Shamu Rocks America show at the end of the afternoon, which is different.
Also don't miss feeding time at the dolphin area. You buy a few fish for a few $ and the dolphins feed from your hands. Your 8 year old should be just tall enough to do this if she's brave enough. In October it should be quiet enough for you to turn up at or just before the published time for one of you to queue to buy your fish (get lots - it's definitely worth it!) while your DD and someone else get a good spot by the pool. The dolphins will come to you wherever you are, though.
There are hand washing facilities right beside the pool - scrub hard or you will smell of fish all day!
There's also a baby dolphin pool in a different area - quite close to the entrance I think - where you can watch the youngsters playing. Your DD will need to sit on someone's shoulders to get a good look though.
Have fun. We may be there on the same day as you!