Work out your route before you arrive. The counter is not the place to do this arithmetic with four people waiting behind you.
Route 1 — entry plus minimum consumption. A small per-person entry fee, generally in the mid-teens in US dollars, plus a per-person minimum spend on food and drink of around ten dollars. That buys a lounger, an umbrella, the pool and the facilities. If you eat lunch there and have a couple of drinks, you hit the minimum without noticing. This is the right choice for light drinkers, for anyone on a short call who will only be there three hours, and for couples.
Route 2 — the Fun Pass. A separate wristband, generally under twenty dollars, covering the inflatable slides, the climbing iceberg, the floating trampoline and the paddleboards and kayaks. This is not included in entry and is charged per person. If your children are the reason you are here, this is the thing you are actually buying.
Route 3 — the all-inclusive package. One price covering food and drink all day. Worth it for groups that will drink steadily and eat more than once. Not worth it for a three-hour cruise stop.
All three are bands rather than quotes and the club revises them. Confirm current rates before you travel. Towels and lockers are extra across all routes, and paying in pesos beats paying in dollars by ten to fifteen percent.