We had a seat at the aquarium level, and I booked her a diver to hold up a sign that said "Thanks for everything Mom! We love you!". She enjoyed the food and the atmosphere very much, but we wouldn't go back because of the lighting, and it was very noisy. It's definitely very cool to encounter once, I was on the edge of my seat waiting for the diver, so that probably added to the excitement!
She was able to read the menu just fine, and I think I did read the note the diver held up for her, but mostly because I wasn't sure if she could make it or not. You can see some video/pictures of it in my review of Coral Reef here:
http://disboards.com/showthread.php?t=1948898. The pictures are with flash on, if that gives you indication for how dark it can be.
When I have some time this weekend I'll pull up maps of the different parks and note which queues and rides I remember giving us some navigation issues on and which ones you should skip with RP.