I used to live there. It's a good time, well-run, and not too out of control like in other places. The parades are fun (and they're all listed on that website). I believe it's $10/person to get down on Strand where the main events are. (Trust me, it's better this way--it was getting to be a big mess before they started charging for it.) Most hotels are booked, but you could probably find something just off the island.
Enjoy! We are leaving on the Mouseboat the day you get back!