Spa is $300 final cost w expected tip for one hour.
Rosewood spa is same price, maybe a bit less, 5 min walk from Andaz lagoon, and more special.
OllaCeviche is all raw seafood, except for one cooked lobster dish. It and OllaTaco menus avail to beach pool loungers, so think it would be just fine to dine with items across both menus. They are steps apart.
Boat service is cutesy, not practical. Four trips daily each way in a circle for free, midday. The way to get between resorts is walk or hotel's free car.
Bring $100 in singles for tipping. Everyone is expecting.
Thai at Banyan Tree is A+.