Take the ferry from Fajardo or fly. The campground is on the exquisitely beautiful Flamenco Beach. No concessions, but a trip into town by bus is easy and cheap. It is well protected at night, with guards. The ocean, hiking, snorkeling are the best there is.
Summer is another story.
The atmosphere is chaotic, the ferries are overcrowded and it's a zoo. The amazing thing about the forests of Puerto Rico is their gentleness. There are no poisonous snakes, the few scorpions are not very toxic, but there are 'killer bees' now. In the last 6 years the africanized bees have taken over the native bee population, by and large. Stay away form bee hives.