Are there any scooters to hire at Thong Nai Pan and are the roads good enough to travel round the island?
I don't know if there any scooters to hire at Thong Nai Pan but some of the roads on the island (in my opinion) are not good enough to travel around the island on one. However, many people do rent scooters in Thong Sala and travel up and down the west coast.
There are plenty of places to rent scooters in Thong Nai Pan though you should be aware that the road is not fully paved so you should be very careful when taking it out of the village. If you have never rode a scooter before it is not the place to try it out.
In the journey there and the journey back having done it twice I saw 3 accidents involving scooters, bad odds. Unless you are a very experienced rider I wouldn't recommend it. In fairness the roads seem to be improved and the first time it wasn't tarmacced hardly but it's not worth the risk in my opinion. Just find a taxi. If you do come off the scooter you can end your holiday, have expensive doctor bills or bike repaid bills even if you are not badly hurt. The fatality statistics are bad though as far as I am aware
Better to get to Chaloklum and hire a scooter from there or even from Thong Sala if you want to explore the island.