I stayed on Don Det, these two small islands connected to each other by a bridge. There should be a dozen new guesthouses. Electricity outside the rooms usually run from 6pm to 10pm only. The main attractions: The Liphee waterfall is a sight so see -- a roaring collection of powerful falls spilling down at odd angles along a branch of the characteristically coffee-coloured Mekong river. To get here, take the first right after the French Bridge and follow the signs -- it's bikable and walkable. If you haven't paid the 9,000 kip admission fee at the gate, you'll have to pay it here, but your ticket will be good for the whole day.
To the right of the road that leads off the bridge, an old steam engine is on display with a sample bit of the small gauge track that was used to transport mostly teak wood down to the French port at the southern tip.