From Luang Prabang to Vang Vieng From Luang Prabang, we first headed south to the “adventure capital of Laos”—Vang Vieng. Fortunately(?), thanks to the China-made rail system, this 1.5-hour journey is now a breeze. The thing we’re realizing about China-made systems is, they are reasonably organized. You can also count on them for good security measures, like confiscating your newly bought…