Para-sailing is not recommended, unless you are confident that the boat, equipment, and most importantly the crew are safe and professional. Check out what happens with other customers first. Try one of the beach operators on all of the major beaches, if your hotel doesn't have cats or dinghies. The November-May northeast monsoon season, in particular, provides steady winds with flat seas and clean, clear water. Peak season for winds is November-February.
Operators are reluctant to rent out equipment when there's a heavy surf.
Patong, the most developed of these, has seven or eight windsurfing shops along the beach. Lessons are available for beginners. The quality of equipment of instruction is sometimes better at the big hotels, although some of the independent operators offer fine service as well. Phuket is a perfect destination both for confirmed windsurfing enthusiasts and for people who want to try it for the first time. During the November-May northeast monsoon season, in particular, steady winds together with flat seas combine with clean, clear water and superb scenery to make this an intensely rewarding experience.