Many boat tours stop by Koh Ta Kiev Island for an hour or two as part of a 3 island trip.
You can also leave in the morning from Otres Beach and come back in the afternoon.
The trip from Otres is typically 55 minutes each way.
The 3 island trips cost $15 including lunch. Free trips if you're a guest at Crusoe Island!
You can rent a boat to take you to the island for about $50 one way, and get up to 20 people on the boat.