two best options are
juicyads
http://www.juicyads.com/ref2.php?ref=99
- try some 300x250 ads to your best converting tours. if you chose a tube site to advertise on, then perhaps sending to your tube tour is a good idea.
plugrush
http://www.plugrush.com/?ref=63
- set up campaigns for galleries on gallery only sites and select asian niche.
make sure you select good countries, correct niche, and if it's a video/picture site - always double check the sources yourself to make sure your ad won't end up in some lousy footer behind 3 popunders or something annoying like that.