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Gabe nailed this one!
just checking out some of the older questions and answers here at Activerain,i find the listing sites are regionally popular. for example, around here nobody has even heard of craigslist, yet in some places everyone knows of it.
VRBO does very well for seasonal rentals. Craigslist is another good one. And, don't forget your MLS.
Zillow for sure.
I would try Zillow.com, I list properties for sale as a preimer agent, should work the same for rentals. Like them, or hate them they do get a lot of web traffic and views (which they call impressions).