不需要签证。可以玩一个礼拜。

beach, islands, snorkeling, scuba diving, surfing...
San Juan old town
drive in the mountains
rain forest park
telescope (largest), cave (largest or second largest)
festivals (always festivals somewhere)
many colorful towns, like Ponce
....

Puerto Rico 好象什么都有的玩，山呀水呀的。