prices on the Yasawas

Hey,
can anybody tell me how much money you usually spend in BL- or Octopus Resort per day? accommodation/transfers are already paid, but I have actually no idea how much cash I shall take with me. Do they accept credit cards for activity payment?
I don't intend to spend much money there but maybe some for a cave trip to the blue lagoon or some snorkeling would be appreciate - or perhaps just for a cocktail ;)
thanks :)

Those two places will accept credit cards, although they will add a surcharge for doing so.
Snorkelling is free if you have your own equipment, or something like $5-10 to rent equipment.
The cave trip was about $20, which is roughly what most activities cost.
Beverages cost extra, starting at about $4.

In my two weeks in the islands I think I spent about $50 over and above the accommodation/meal charge.