The Manta Resort -- Pemba Island, Zanzibar
Now open: Africa’s first underwater hotel room. Okay, "hotel room" might be a slight understatement, as this place is more like a three-story private island: Catch rays on the top deck’s cushy daybed, chill out in the dining/ living area on the water deck, and sleep with the fishes.
Depth: 13ft
Rate: $1,500/nt for two, $900/nt for one
Most exotic fish that'll stare disapprovingly at you through the glass: The coelacanth -- a rare, endangered, and totally scary-looking fish that hasn't been caught since 2007. In fact, prior to that, one hadn't even been seen since 1938.