i was looking through the various Castaway Cay excursions for an upcoming cruise and want to participate in so many of them. unfortunately, i know that time is limited and i can only do two, maybe three if timing works out. but then i remember about tipping for cruises. i know about tipping the servers and etc. on the cruise, but what about tipping for excursions? is that also something that is standard? i don't want to be the embarrassing fool who didn't bring any cash to tip cuz i didn't know it was customery to tip. which of these activities follow with tipping and how much? 1. Stingray Excurusion - tip the instructor? 2. Cabana Massage - definite tip on this one, but how much usually? 20% or flat rate of $X per person? 3. Parasailing - tip the boat captain and crew? how much? 4. Banana Boat - tip the boat pilot dragging the banana boat? how much? appreciate any help! thanks!