If the hotel is all -inclusive you will have to pay, last time I asked something like Sandals was US$100 /person a day. You can usually do this yourself but there is always the chance they won't allow it. There are companies that you can book things like this, but sorry I don't know who they are. On the other hand if the hotel is not AI you could probably just wander in, do the decent thing & spend some money there, have lunch etc...