Enthusiastic and reliable Alex and Tek offer tours of Savannakhet, including guided homestays (for two people, all-inclusive, US$160) and cycling trips (US$175) to Dong Natad and destinations further abroad, including overnight treks in Dong Phu Vieng NPA (US$360) and, by the time you read this, possibly Phu Xang Hae NPA. Highly recommended.
Marvelaos can also help arrange transport, and hires out bicycles (per day 30,000K) and motorcycles (per day 100,000K).
