First off, for those that don't know, Adventure Maps are user-created maps that add a story and provide a goal to Minecraft rather than just surviving in the wilderness. I've played a few Adventure Maps in my time playing Minecraft and some of them are amazing, but a lot of them are pure crap.

Some good ones I've played include:
Black House
Labyrinth
Prof Grizwold and the Curse of the Pyramid
The Redmurk Mystery

If anyone wants to post any maps that they've played and thought where good (or bad) please go ahead and do so and leave a review if you want to as well. It also kind of helps if you say the length of the map as I've seen some really short ones out there too...

Well I like "The Tree Of Life" Map its pretty fun (played it ALLOT of times) It takes about 45-60 mins to do so i guess its kinda long and you can play with 2 people also its from the same person who made The Wizard Burgmund

Link: http://www.minecraftforum.net/viewtopic.php?f=1034&t=287265

Also you might want to add links for some people since there to lazy to look for the look for (Because now a days people dont know how to type google.com)

Dude, what is up with your picture? Get it? UP?

I Know a Couple of good ones

Criswelvania:http://www.minecraftforum.net/viewtopic.php?f=1034&t=213875 (this is a big map)

Escapecraft:http://www.minecraftforum.net/viewtopic.php?f=35&t=72298
Escapecraft 2:http://www.minecraftforum.net/viewtopic.php?f=1034&t=83457
Escapecraft 3:http://www.minecraftforum.net/viewtopic.php?f=1034&t=183206

The Escapecraft's is more of a puzzling one buts probobly the best Custom map series for Minecraft.