I'm sorry, I am not familiar with that end of the island. Won't you have your own coffee maker in Xanadu? Perhaps you don't want to disturb the others? Anyway, someone will be along shortly to answer your coffee question.
I'm a diver, so I haven't done any Altunha tours. I've been to Caye Caulker and loved it. So a snorkel trip over would probably be quite enjoyable. I was inland for a few days and did the Actun Tunichal Muknal (the Cave of the Crystal Sepulchre) That was awesome.
I've done the zoo and the cave tubing but I'm not as thrilled about that as many others here are. Mostly because of the price tag. If it was like $80, maybe but at $140, I found it to be too expensive for what *I* got out of it. I'd rather go on 4-6 dives for that kind of money, or go out to the Atolls for a dive day. That's just me.