1

Trekking in SEA is almost always guided and overnights are in villages/home-stays. A solo woman should stay with a group/guided trek. If you're from North America or Europe, you'll have far better trekking opportunities nearer home. There is almost zero wilderness/ecological consciousness in SEA.

2

Pretty much agree with above sentiments.

Popular Trekking areas-

Vietnam- Sapa region and Fanispan/Ethnic Villages/Homestays.

Laos- All around Luang Prabang in the north, this can include homestays, river kayaking waterfalls and ethnic villages. See Green Discovery website for ideas/routes and popular treks/excursions. Maybe around Vang Vieng, if you can stomach the tubing crowd.

Thailand- North of Chaing Mai in Pai, though when I was here in 2001 its was more low key, heard over the last decade this town and area is a shitfest, but we trekked, bikes and tubed, ethic villages and waterfalls/rivers

Burma- Popular trekking here is a 2 nights 3 day from Kalaw to Inle Lake, via homestays and ethnic villages, also the Hsipaw area northeast of Mandalay, and further afield in Namsham area via Hispaw. Others may know of more in Burma.

Overall, not as many choices nor as nature/fauna rich as Central America places like Guatemala, Nicaragua, Costa Rica.

Southern China and Yunnan area is great trekking, via train from Sapa Vietnam or Laos, or Thailand.

Nepal is pretty much the end all of trekking.

Of course time of year and seasonality is all a factor for above and can vary from region to region and month to month.