Boat Trip in Phu Quoc

Several tour operators on Phu Quoc offer the chance to get off the island and into the sparkling turquoise water that surrounds it.
The most popular option is a full day of either snorkelling or diving -- expect to pay around $17 for snorkelling, $30 and up for diving.
Other tours will take you on a circle around the island to a few off-the-track beaches, to the deserted islands to the south, or on a night time squid hunt.

The last option seems to be particularly popular -- once you've caught a squid, the onboard chefs will prepare it in several different ways.

Most guesthouses have brochures from a few different companies, and can arrange the tours for you.