Much of SE Asia is great for touring. Furthermore, from December thru February, northern Thailand, northern Laos, and northern Vietnam all have great touring weather. It's cooler (but still warm) than the rest of the year, and it's also the dry season. I haven't been to Vietnam, but I've toured in Thailand & Laos and both are excellent touring destinations. They're also ridiculously cheap. There's no need to carry a tent, sleeping bag, or a stove, because good inexpensive accommodations are readily available, and delicious and cheap prepared food is also readily available. There's lots to see and people are friendly.