Namtok Mae Surin National Park

The park's main waterfall is Mae Surin Falls, one of the tallest in the country at over 100 meters high. During the dry season (November to February), you can hike to the bottom of the falls, but this gets trickier and more dangerous as the monsoon rains arrive. You can see the waterfall from the parking lot of the park at any time, though–so you can always get a good picture even if a hike is not on the cards.

The Pai River, which runs through the park, is a good place for rafting–and visitors can even camp on the shore.