SamuraiJack's
GM_Beachplay is a map set on a beach, as suggested by the name.
It's perfect for offroading as it features bumpy terrain, but it's also got a race track if you want to race your vehicles on flat terrain. Since it's a beach, it also has plenty of water for water contraptions. The skybox is also tall, which is useful for air contraptions. So this map will pretty much work for any kind of contraption your mind can throw together.
As for buildings, there's a hangar for your airboats and such, there's marine platforms, a wooden house with a basement, and a Combine "fort"
The map does have a lack of detail, but the author says that's pretty much intended as it's a Garry's Mod map and populating the map with props is something that should be up to you.
Download it here:
http://www.garrysmod.org/img/?t=dll&id=72998
Be sure to examine the
forum thread if you're in need of any help or support for this map![...]
