Relax!
Bangkok is a great place to spoil yourself a little bit! There are many places which offer different kinds of massages and beauty treatments to affordable prices.
There's a good spa on Rambutri Road (parallel to Khao San Rd), had a Thai massage there every evening :). 1hr costs around 200 THB.
More info on Shewa Spa


The Interchange
Search for bargains at over 15000 stalls
bts skytrain in Bangkok
BTS Skytrain Chit Lom Station