Vietnam presents plenty of opportunities for activity and adventure, hard or soft.
The Mekong Delta is a great place to get on to two wheels and cycle along islands in the Delta, discovering local villages and learning about the culture in this part of Vietnam.
For serious trekking, most people head to the far north of Vietnam around Sapa or Ha Giang where the mountains are really stunning and multi-day treks or shorter day-walks are all possible.
Dry Halong Bay to the South of Hanoi is another area popular with trekkers for its beautiful scenery (less mountainous than further north) and for some great day hikes.
The Central Highlands of Vietnam offer hilltribe villages, lakes and waterfalls and some excellent walking in a less-visited corner of Vietnam.