SihanoukVille is the major jumping point to Cambodia's Tropical Islands. Besides a few island resorts, there are dozens of backpacker places with tents, hammocks and dorm rooms right on the beach. These cost from $2 a night to $8.
Food on the island is generally a bit more costly than food on the mainland, but you can bring your own snacks and drinks, if you're just going for a few days.
Trips to the islands cost $5 to $20, one way, and most of the trips take 40 minutes (2 hours on the slower boats, but you get a much bigger boat to ride in)
At The Beach Resort, on Koh Rong Samloem Island, there are huge Full Moon Beach Parties, each month. All the necessary and expected activities you would expect at such a party.
Besides Koh Rong Island and Koh Rong Samloem Island, the two biggest islands off the coast of SihanoukVille, is Koh Ta Kiev Island near Ream National Park. All of these have cheap places to stay.
There's limited electricity on the island. Usually at night. However, there's free Wi-Fi all day at most places, and large batteries to charge your internet devices.
Full phone service on all the islands.
Medical facilities are limited on the islands, so take care. Most of the islands are mountains and jungle, with beaches, both rocky and sand at the edges.
Lots of snorkeling, scuba diving, boating, fishing and of course, swimming.
Also, paths through the jungles, small lakes, and waterfalls.
The only party village on all the islands is at Koh Rong Village, with about 40 restaurants and bungalows. Other than that, most places have hundreds of meters of unspoiled beach.
From November 'till March (or May), many of the island accommodations are filled up. You will need reservations, even for a hammock. You can check out places on the Koh Rong website, as well as Koh Rong Samloem and Koh Ta Kiev Island websites for more details.
SihanoukVille, and all of Cambodia's tropical islands, are fantastic right now, but this won't last forever. The international companies are arriving, and soon we'll have airports, casinos and golf courses on most of the island.
NOW is the perfect time to go backpacking on SihanoukVille's Island.