Its customary to tip excursion people a few dollars depending on the price of the tour and the effort they put into making your excursion worth doing and spending the money on. I don't know where the $200 came from, but that is wrong. The amount of your tip is up to you and not included in the price of the excursion.
Sometimes, you'll have a bus driver make the trip super interesting, may-be a $5.00 tip may we a nice idea, again, totally up to you.
The previous poster, quite frankly doesn't know what he's talking about and I don't even understand what he's trying to say.. He seems to have some gripe with Royal Caribbean, but we've asked what exactly he doesn't like and have yet to get a response...
What excursions have you signed up for?