The Pai river winds through some very lush, pretty scenery.
One relaxing and easy way to travel through it is by inner tube. Many guesthouses and travel agents around town can organise rental of a tube -- they are large and pretty comfortable for an hour or two. Generally, a tuk tuk or pick-up will take you upriver a few kilometres (exactly how far will depend upon water levels), from where you float downstream back into town. Tube hire costs around 250 baht per person including transport. Take care during rainy season as the flow can be very strong but mind your bum on the bottom during dry season! Do be sure to wear suitable attire -- if you wear a bikini or go topless on the river, you'll end up walking back through town in the same, which isn't respectful of the locals. It's a good idea to pack some spare dry clothes to leave at the agent's office, along with your phone and wallet.
By Mark Ord.