Watch out when doing water sports at the beach areas.What happens is that a foreigner hires a jet ski. There is a common tourist trap where tourists going for jet ski-ing are being forced to pay for equipment damages (which are not caused by the tourists) amounting up to 100K baht.
On return the vehicle is checked for damage. The damage may have or may have not been caused by the hirer. They are then set up for an extortion bid where a disproportionate amount of money is demanded. The hirer may be threatened either actual or implied by being surrounded by a group of Thai men. Most people just pay to get out of an ugly situation.