Y'know, thinking about it, there aren't a huge number of overland/outdoor style modules compared to the number of crawl types. Even those that do have overland bits, like the Forgotten Temple of Tharzidun is pretty much just a dungeon crawl with a very high ceiling.
If I had to say, my vote would go for the old Isle of Dread. Despite some rather bewildering organization, IoD is a very solid module. It captures the feel of the Lost World type setting very, very well, has a nice intro with the blank center map (bloody fantastic idea that) and the letter from Rory Barbarados (I think that's the name). Lots of stock ideas without having them clash too often. I am REALLY looking forward to the new AP from Dungeon for this exact reason.