Here's a quick run-down - feel free add more!
A-One, Nopparat Thara Beach - Western & Thai - nice setting across from the Beach. Great breakfasts & Sunday Roasts.
Krua Thara - National Park entrace, Nopparat Thara Beach. Seafood - one of the most popular in the area.
The Massaman - approx 100m up from Siam Commercial Bank in Aonang. Great Massaman Curries.
Ruen Thip - hard to find in Krabi Town - you will need a taxi. One of the busiest restaurants in town.
Royal India - behind Scuba Addicts on the beachfront in Aonang. Authentic North Indian cuisine.
Boat Noodle - near 'The Cliff' Resort. Popular with locals, cheap Thai food done well.