I was recently at the Sofitel Krabi. We took the hotel speed boat to the Hong Islands, which cost 1,750 THB pp. Lunch was included. This is a short distance. The hotel does offer speed boat to Phi Phi Islands. This is a longer distance, and more expensive. I don't recall the cost though, but I'm sure you could email the hotel. As you may know, the Sofitel Krabi is about an hour drive from Krabi airport. We took a taxi from airport to hotel at cost of (I believe) 600 THB and hotel booked taxi on return for 796 THB (+ tip).