What are the best options for adventure in Thailand?

We (2 girls) want to try a lot of new and different things, like diving, diving, rafting, kayaking, etc, while we are in Thailand in October-November Can someone who has experience with the details of this please, the best I've done there, where, cost, when you left, why was he the best? If you permit, a list of things to respond to the same things as above would impressive and much appreciated. We are both fitness average of 20-somethings.

There are so many options I do not know where to start. diving and kayaking … go to South (Krabi, Trang, Satun) Mountain biking is offered many places .. not only in the north but also in Koh Samui. rafting, visit the national park Thailand's largest province of Petchburi.

Kayak Fitness Instructional