To go home, check with the CMs outside of the Hoop De Doo. After the 7:00 and 9:30 shows, they set up buses at the internal bus stop to take you directly back to your resort, rather than having to go to MK on the boat, or another park, or Downtown Disney. It's pretty convenient if you time it right.
Try to make your reservation an hour before or 1/2 hour after the Hoop De Doo starting times. Otherwise you'll be jammed up at the boat dock with everyone going over there for the show.
Also, if you have time, go back to the beach around 9:30 and watch the Water Electrical Parade, then hang around for the fireworks at 10:00. The music is piped in there and it's a nice view of the fireworks above the trees. A fun way to spend an evening.