Transportation 
Traveling to Koh Larn Island is quite easy. Firstly, speed boat is the fast way to get to Koh Larn Island within 15 mins. Along Beach Road in Pattaya, you will find speed boat renters soon enough. Usually, the cost of hiring a speed boat is between 1500baht to 2500baht. What determine the price is the size if the boat.
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The other way travel to Koh Larn Island is by ferry boat which is not fast as speed boat and it will take you 40 to 45 minutes to get to the island. If you want to take a ferry, first you should go to the Bali Hai Pier where the ferry is docked. If you don't know where is Bali Hai Pier, you can just ask people around you or you can also take a taxi or motorbike to take you there.