Try these if you're into action adventure:

Prince of Persia
Uncharted
Ninja Gaiden Sigma
Tomb Raider

Folklore (Action RPG)

I don't feel like sifting through the post's :P But hopefully someone mentioned the following.

Ratchet and Clank Futures!!!! It's amazing ^^ Plenty of exploring, and while it's not 1 open world, you do get many amazing ones to romp around in :)

Uncharted >: ) It's amazing!

Warhawk! Is a 3rd person online only game, but the worlds are huge and traversing them is entirely too awesome :)

Not quite "adventure" but I thought Folklore was fantastic! It's more along the action RPG type, but a totally awesome experience none the less ^^

thanks I will rent uncharted before thinking to buy PoP.