It is certainly feasible to to do a day trip to Khao Sok and you will find many on offer when you arrive that will typically include an elephant or jungle trek and canoe trip on the River Sok or tubing. This will give you a flavour of this huge and beautiful National Park. To include a visit though to the awesome Rachaphrapha Dam/Cheow Lan Lake (an hour further east) would warrant at least one night's stay either in a lodge or treehouse at Khao Sok or a floating rafthouse at Cheow Lan.
Thanks very much, that's really useful :-)
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