The currency in Crystal River is the US Dollar.
We always advise purchasing your currency before you travel as rates can fluctuate. However, if you do decide to use your credit card, it may be best to ring your provider so you don’t get hit with any unwanted fees. It’s always a good idea to have some cash to hand as you’ll be expected to tip at least 15% for most services in the US. There’s also a number of ATMs located in and around Crystal River if you want to withdraw some cash when you get there.