I'd really like to start over and not open up all of the forts so quickly. We're to the point now where we stopped opening them up just to save some fun for later and there's only 3 left
. I think that's one of the most fun parts. We also explored and did so many side quests at the beginning that we were way further than I think the "average" one would be compared to the story line.
I swear to you I could ride that damned hang-glider all day every day. Just to see how far I can go on it and such. Right now we're just killing time cleaning up the the islands of treasures, relics, and letters before moving on with the story line. We've yet to even try the co-op yet.