This is my first trip to Krabi. I signed up for a full-day rock climbing experience with King Climbers via railay.com. My climbing guide, Sue, was awesome. Even if you're an experienced climber, he would make an excellent climbing partner. I've only climbed outdoors once, but with his guidance and encouragement, I topped out 6 routes in one day, including a grade 6A route that was 30m high -- all on one attempt each!
I highly recommend King Climbers for anyone who wants to go climbing in Railay. Remember to stop and enjoy the view from the top of each route. It's nothing short of breath taking! :)