There are a few things I would change, like getting rid of Jacob's stupid 'bodyguards', and Jack definitely didn't get enough screentime... well at least not for me ;) But other than that, there is nothing I can think of that I'd like changed.

Edit: I would not have killed Shannon off so early.

I wouldn't want to change any *big* stuff... possibly suggest a little less relationship drama and a little more Dharmaville. =D

Well first of all I would erase Kate (stay with me) as she was designed to be the leader before they decided not to kill of Jack. So now no pesky love triangle! :D

Also I'd just go insane. I'd make it crazy and way less commercial than the first season was. For example Sawyer would be a robot, and Hurley would ride the giant Hurley Bird around and then Ben would show up. This is all episode one.

Wouldn't have killed of Shannon or turned Michael into the "bad guy."
+ more Jack.

Wouldn't have killed off Boone so early.

I would have liked to see how Sawyer and Juliet got together and maybe have her not die.

This whole hatch storyline was kinda dragged on / = It was brilliant towards the end but it got a little boring for me around the middle of season 2...they had amazing new characters like Ana and Eko but at times they could've done a little more with them.
Other than that I'm completely happy with Lost ( :

Do I even need to explain why?

I can't think of anything I'd change in the other seasons though, at least not off the top of my head.

If I may be so bold as to quote Hurley: "I want some friggin' answers!"

I would mske it so Juliet never died , and Sawyer actually got married to her ....

nooooooo ^
juliet can NEVER EVER merrie sawyer !!!!!
i would hate it alot !
i wouldnt make them all die

I would NOT of killed Juliet of.....I would have explained at least Sawyer and Juliets relationship more,And I would defenataily Not did all the crazy crud that went on it would have been more .... I don't know the right word ...um maybe real because I was ticked off At the beggining and was not pleased until the end of the season..they really could have done that ten times better than they did...and sawyer and Juliet belong married and happy!

I wouldn't have killed of Boone ! :(

Skate

I would keep all the rest of the storyline, but I would keep Charlie in it. I would somehow bring him back to life. I think I would somehow raise Boone from the dead too. Somehow. ;)

Definately season 3 i never would have let Charlie die!!! He still would have gone to the Looking Glass but he would have been captured by Mickiel and then escape later on. I LOVE CHARLIE

Shannon wouldn't have died so there would be more SHAYID FLUFF! Oh and also Season 1 so Boone would not die. Or 3 so Charlie wouldn't die.