The Buddhist Tham Yai Phrik Vipassana Monastery is built around several meditation caves running into the island’s central limestone ridge, and offers fine views from its hilltop chedi (stupa). Monks and mâa chee (nuns) from across Thailand come to take advantage of the caves’ peaceful environment, and foreigners wishing to sample monastic life are also welcomed. Studying at the monastery is free of charge (phone ahead to make sure there’s room and bring your passport), but you’ll be expected to follow the monastery’s strict code of conduct. Whether you visit for an hour, or stay a month, leave an appropriate donation (roughly equivalent to basic food and lodging if staying a few days) with the monk or nun who shows you around. Your tour will likely be extensive, and if you have any interest in Buddhism it will be well worth your time.