Understand the desire to do the GeoArt. Some of them are very cool.
For the muggles (non-cachers), the OP is referring to a series of caches that make a symbol on the map when completed. This one requires 51 caches to complete the symbol of a star. Some out west were there is more unused space are extremely complex. There is one in California that maps out the shape of an RV.
I've been through the area years ago and recently did some research for the general area. Haven't visited any of these, but they all made my list of possible stops. About 10 miles eastward is
Mike Roess Gold Head Branch State Park. If you are retired military, there is also Camp Blanding available.
Westward a few miles is
Ocean Pond in Osceola NF.Ocean Pond in Osceola NF. If you don't care about access to town, this may actually be a better location as you won't have to deal with any traffic. Also depends on exactly where the caches are located.
Good luck and have fun. I'm still one cache away from completing my first GeoArt.