When in Krabi spend a day or two at Railey beach. It’s a peninsula but cut off from the mainland by steep cliffs so the only way in is by boat. Accommodations range from hostels to 5 stars. It has one walking street, no cars, amazing beaches, awesome rock climbing (for beginners and experts), good food, great kayaking, an awesome vibe and its just amazingly beautiful.
The Namtok Ron Khlong Thom hot spring waterfalls are also worth the trip. It’s like god’s jacuzzi. Steaming hot water coming out at body piercing pressure into smooth tubs made entirely by nature through centuries of water erosion.