At the ticket office, they accept cash only. INSIDE the park there is an ATM, but of course that doesn't help you when you are still outside at the ticket office trying to get in. Besides, the ATM is often down.
There are a few restaurants in the park. Stay away from the fast food, it's awful. Instead I highly recommend getting a coupon for La Selva restaurant. The coupon is available at various info counters. For $12 you get a fantastic buffet like what you would see in a fancy resort.
You can skip the raft float trip. It's kind of relaxing, but not much to see. You HAVE to do the speed boat trip up to the falls. They take you up close a few times and you WILL get drenched. We had on raincoats and rain ponchos on top of that (sold in the gift shop) and our tshirts were still soaked.
Allot more than one day for the park or you will feel a little rushed. Two days is plenty though.
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