There are a few islands a couple of hours form Bangkok which get slammed every long weekend with expats heading for the beach (Ko Samet and Ko Chang to name a few) but they are relatively still pretty far away from Bangkok and of course on every long weekend the hotels fill up and prices go up.Ko Sii Chang is the closest island in Bangkok but is always overlooked, if you have a car or rent one you can get to Si Racha (The port town) in just over an hour, otherwise you can a bus from Ekkamai or Mo Chit Bus terminals for between 90-120฿ (£1.80-2.40/$3-4). From Si Racha you can take the ferry across to Ko Sii Chang which takes about 40 mins and cost 90฿ (£1.80/$3). The ferry leaves every hour between 7am-7pm (Sometime more often on long weekends). This means if you time if right and miss the traffic you can be on the island in 2 hours!

Hotels and hostels can be found pretty cheap, id recommend booking in advance if your heading there on a long weekend. You can book Hotels in Koh Sii Chang on Agoda here.

When you arrive you’ll see a bizarre Asian lighthouse…

 

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And you can rent scooters straight from the pier or grab a monster (more beefed up) version of a tuk tuk with super suspension to take you to your hotel, which as we found out on a long weekend you should definitely book in advance otherwise you may be left stranded with no accommodation! :/
Theres a beach on the far side of the island and a few cool sights, temples etc, the best thing though is the amazing fresh seafood available everywhere! The islands definitely not as picturesque as some of the islands with long white sandy beaches but it has really nice relaxes fishing town vibe and is definitely worth checking out!