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The main attraction is to go tubing into the cave. It is really huge, taking 15-30 minutes to get to the end, and then the same time to get back. There are two ropes inside the cave, be sure to follow both. Water is rather cold, but bearable. There is also a zipline at the cave entrance.
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Very nice cave and superior to the one at Blue Lagoon. You might feel the entrance a bit tight at first time but when you get past that most parts are easy to walk. There is mud and water so be prepared if you wish to explore all the cave. Price includes head lamp.
A spring-fed lagoon at the bottom of "Golden Cave". Nice place to relax, swim and play on the rope swing. The waters are inhabited by a few hundred carp that will eat locally sold fish food out of your hand. The cave above requires a modest 100m hike up a makeshift bamboo ladder. Once inside, there is a short walk to the Sleeping Golden Buddha and glimmering stalactites about 300 m further inside. 10,000 kip entry and 10,000 kip to rent a head-torch, recommended if you go deeper into the "real" cave, past the Buddha. Guides for the cave are advertised at 50,000 kip. A number of imposters claim to be the Blue Lagoon — keep to the main road and you should be OK.
You can visit this organic garden and restaurant just before or after your visit to the Blue Lagoon. They also undertake eco-projects to try to protect the natural environment in the Vang Vieng region, and you can volunteer.
An extremely steep half-hour hike that offers a fantastic 360° view over the surrounding valley and karst mountains. The trail is in excellent condition, with steps, banisters, fences and cables on the more dangerous parts. Bring adequate footwear. Try to be at the entrance at around 16:00-16:30, so you reach the summit on time for the breathtaking sunset.
A couple of small shops on scenic hill, selling drinks and simple meals en route to Blue Lagoon and several caves. There is a mechanic shop where you can get air put in your tyres and basic repairs done. Also, this is the starting point for hiking up to Pha Ngeun Peak.
Equal Education For All (EEFA) runs afterschool English classes for local children in Northern and Western villages of Vang Vieng. They are always looking for volunteers who can ideally stay for a month at least, but if you've only got a couple of days they may still want your help. Anyone is welcome to observe the classes, participate and contribute in any way you can. Look for Alex at Vang Vieng Organic Farm or message Equal Education For All on Facebook or @saelaovolunteer on Instagram.