So I've been playing the World of Warcraft trial for the past week*, and one of the things I'm enjoying the most is just the pure expanse of the landscape. I think I'm a bit of an explorer by nature, anyway - whenever my family goes to the beach, I always end up walking all the way to the end and back looking for interesting things to photograph, cool rocks and shells, and all that rot. Therefore, I love games that have large areas with lots of nooks and crannies to probe into, caverns to spelunk in, mountains to climb, etc.
I don't know if a game exists that is exclusively exploration, but I would love to play something like that. Perhaps an open-ended GTA style game where, instead of the missions involving killing people or stealing things, you have to find fossils or jewels, explore caverns, find exotic species of animals, maybe investigate lost temples for priceless artifacts. There wouldn't be a focus on combat, though obviously there'd be some - after all, exploration has its risks like wild animals, angry natives, and the like, but the focus would be on the environment. There could be elements from Metal Gear Solid 3 as well, like the camouflage system, or having to hunt for your food and heal your wounds.
I would kill for this game, if it existed.
*P.S. - I think I'm hooked, currently looking to get an actual copy of the game.