The Plain of Jars:
Jar site 1 is the easiest to get to and the best, while sites 2 and 3 are also worthwhile (sites 16, 23 and 52 have also been cleared of ordnance and are visitable); best way to tour the sites is by hiring a motorbike (the rental place will have a map); site 1 can also be reached by bicycle; tuk tuks are not allowed to take people to the sites, so you’ll have to hire a van or jeep or go as part of a tour; 10,000 Kip entrance fee per site, parking will be an additional 2000 Kip.
Waterfalls: the Tad Ka Waterfall in Nong Het, the Tad Ka Waterfall in Tajok and the Tad Lang Waterfall are all well worth seeing. You’ll need your own transportation (motorbike, van or jeep) to get there; if you only have time for one, go with the Tad Ka waterfall in Nong Het.
Nong Tang Lake: a large lake between cliffs
Hot Springs: Near Muang Kham; have been developed into a resort with indoor bathing facilities
Tham Xang Caves: caves used by revolutionary fighters who had set up multiple facilities inside the caves; worth seeing unless you’ve been to Vieng Xay.
The Mulberry Silk Farm: a company looking to keep alive traditional high-quality silk production by training local villagers and providing them with jobs; tours (very interesting) are free, but they will take you to their shop afterwards; they didn’t put any pressure on us to buy anything though, but we did since the proceeds go toward helping local communities and the prices for the silk products are incredibly low anyway.