If he can't find a glider to fly and in San Juan, there's an FBO at
the Isla Grande airport. Some friends and I rented a C172 and flew up
the coast to Aricebo. Circled the observatory, quite an impressive
radio telescope!
The arroz con pollo is amazing in Puerto Rico. Also coco fria, a
roadside refreshment. Cold fresh coconut (not brown or dry at all)
that some kid lops the top off with a machete and puts a straw into.
Jim