Reserva Forestal de Carite (Carr. 184, km 27.5, 787/747-4510 or 787/747-4545, Mon.–Fri. 9 a.m.–4:30 p.m., Sat.–Sun. and holidays 8 a.m.–5 p.m., office Mon.–Fri. 7 a.m.–3:30 p.m.) is classified primarily as a subtropical humid forest rich in vegetation, including Honduran mahogany, hibiscuses, eucalyptus, giant ferns, and several varieties of palm.
Unfortunately, this forest reserve was severely damaged by Hurricane Georges in 1998, and many of its hiking trails have never been restored. There is one 550-yard trail, though, that ends at Charco Azul, a lovely natural pool.
If you don’t mind camping in sight of the road, Area Recreativa Guavate (Carr. 184, km 27.2) offers nice, shady hillside camping with bathrooms, covered picnic tables, and an outdoor shower. Camping permits must be secured at least 15 days before arrival by calling the forest office or the Department of Natural Resources in San Juan [1] at 787/723-1770.
Links:
[1] http://www.moon.com/destinations/puerto-rico/san-juan