I liked Laos very much! It’s a rather small country, so I didn’t need to travel long distances and could stay longer in some cities.
The Kuang Si waterfalls in Luang Prabang were impressive in this rainy season! In Vang Vieng it’s impossible to skip the tubing (see the movie here) and on the 4000 Islands it’s just quiet and relaxed (although there are currently not so much islands due to the high water level in the Mekong).
In Pakse there’s a big golden Buddha and some more waterfalls…