Heading out from Phuket aboard Discovery, a 47-foot Power Catamaran built by Stealth - Asia Catamarans, already sets a certain tone before the engines have even turned over. This half-day tour is designed for up to 30 passengers and takes you directly to Koh Racha Yai — one of the more rewarding destinations reachable from Phuket's coastline.
Koh Racha Yai sits south of Phuket and is well regarded for the clarity of its waters. The four-hour format keeps things focused rather than rushed, giving you genuine time at the island rather than a fleeting glimpse from the deck.
Discovery herself is a comfortable platform for the crossing. At 47 feet, the Stealth - Asia Catamarans build delivers the stability that a power catamaran hull is known for, which matters when you're covering open water with a group of up to 30 people aboard.
If you're based in Phuket and want a half-day on the water that leads somewhere worth arriving at, the Discovery Khai Islands (4h) tour routed to Koh Racha Yai is a straightforward, well-considered choice.