[notintokyo]

As an occasional stumbleupon user myself, I can say I'm not in the prime mood to book a vacation while using it. You probably prefer 10 people in vacation shopping mode than 300 people in lol I'm bored -mode.

[destraynor]

Definitely true. This is my main concern with things like Facebook ads. I've seen folks buy them by the dozen, and rarely see their money back.

I'd say try your next $30 on Google adwords like "package holidays" etc and see how that traffic performs.