Is there a cost for the tour of the property? Also, if you use their discounts for local activities, can you still pay with credit card?
There is a cost for the tour if you want it guided but you are always welcome to explore it on your own, I wouldn't recommend it though in case you make a wrong turn and end up stuck in the jungle. You can use credit card for certain things but I suggest converting dollars into colones at the airport. A lot of food and beverage places do not accept credit card.
Get an answer from Princesa de la Luna Eco Lodge staff and past guests.