We hired a tuk tuk for wandering around in the evening for only K30,000($3) for 20 minutes. Tuk tuk is the most common transportation in Lao, do not worry about the traffic because Lao people follow the traffic laws very well and the drivers care about their customer's safety but as usual, try to play the bargaining game :). I love playing this game. It doesn't mean that I am tight as I always give them something extra as drinking money if they are good.
We took a VIP bus(this is a double decker bus which is very popular in western countries and recently appeared in Ho Chi Minh city) to Luang Prabang for only $16 with freezing air-conditioning and horrible smelly toilet and security guard with a gun. We were wondering why there was a guy with a gun outside the bus when we stopped for a break. Finally, we found out that last year some rebels attacked the bus and the goverment decided to always send one security guy along with the bus. Anyway, the trip was fine and we arrived in Luang Prabang safely in the afternoon after 11 hours on the bus. I would say that we had no complaints about the trip but 11 hours is a bit too much for sitting on the bus even though the scenery was beautiful :)