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Bike to Sam Mountain: rent a bike from your hotel (USD1-2) and ride 6 m to the base of Sam Mountain. It's an easy ride over flat paved and gravel road, just watch out for traffic. Walk on food from the base of the mountain, up the stairs to the top. Many viewpoints and cafe's with hammocks along the way to stop for a drink and a rest. Alternatively you can take a moto straight to the top of Sam Mountain, a great place to catch the sunset and see the views of Vietnam and into Cambodia.
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As of January 2015 most hotels and travel agents are charging around USD34 for a two person trip to Tra Su (Includes moto drivers and boat fees). If you speak to any of the moto drivers around the covered market you should be able to hire one for around 150,000 - 200,000 dong per moto and can visit Sam Mountain or the Pagoda on the way back. Some of the drivers speak good English. Hiring a driver on your own will save about USD8-10 for a two person trip (depending on your negotiating skills).