This is village about 25 km south of VV to Vientiane direction - you can see here that it has lots of fish on display for which is famous for and those fish are popular snack with Lao. Tha Heua is nestled along the main road, between shores of Nam Ngum lake and below the slope with small temple.
Not much to do here unless you come when there's festival by the temple. Accomodation is very basic and there are a few guesthouses right by the lake.
We stayed a night in the village for the festival in temple. Quite interesting - I saw so many men with guns and even children were so crazy about having plastic guns. People came out to dance and listen to the band and play a bit of lottery with baloons which is quite common, and of course to drink. But it was somehow sleepy atmosphere - comparing from what I saw on other village festivals.
Nevertheless, next morning we aked local fisherman to take us on the ride by his small long tail boat: there are lots of small islets with few trees or some completely bare which you can see in dry season but are inundated in rainy seson. Lots of water buffalos and cattle come to graze there. It was one hour ride into quiet world off the shores... normally any fisherman will be willing to take you after you set right prize.
There are alot of caves in the surounding areas, you can buy a map of the places in town but most of them are useless. You might be able to walk to some of them or you can get one of the MaoTseTung tractors that take people to the caves from various locations around town. If you have nothing to do, which is very possible in Vang Vieng then some of them are worth seeing.