Ko Jum (เกาะจำ), also known as Ko Phu (or Pu) (เกาะปู), is a small island between Ko Lanta and Krabi Town.
Residents of the south end of the island call it Ko Jum (or Jam or Cham), while the northerners call it Ko Phu (or Pu). Local villagers take fierce pride in the two different names.
Ko Jum has three main villages (Ban Ko Pu, Ban Ting Rai, and Ban Ko Jum) and is permanent home of about 1,500 people. On the west side of the island, about 20 resorts provide very simple bungalows.
The villages are sights in themselves, with slight differences in their ways of life. Travelling around the island on a motorcycle is a fun and (mostly) safe way of sightseeing.
Most resorts will also be able to arrange day trips with treks up to the top of Mount Pu on the northern part of the island, which has a majestic view of the islands and the Andaman Sea.
Relax in a hammock by the beach. Swim. Walk along the beach. Small hikes. Many people seem to stay here for a long while just to relax and recharge. There are not a lot of other diversions here.
Most guesthouses and resorts on the island have a kitchen, and are happy to cook for you even if you aren't a guest. Just walk down the beach until you get hungry. The meals are good, and the prices decent.
The island only got electricity in 2008 and it's starting to get developed in the southern part. The constant loud noise from bars and party-goers, as on Phi Phi, has not been an issue here, and only occurs on rare occasions like Christmas and New Year. Beer and stronger drinks are available from guesthouses, or from shops in the villages.
Respect the locals by making an effort to keep bottles of alcohol out of view.
Some people go to Ko Phi Phi or Ko Lanta via ferry. Otherwise, if you want to go back to Krabi Town, just go back the opposite way you came in. The ferries back towards Krabi Town, via Laem Kruat, sail from 07:15 to 08:00.