Here's my concept for a LOST attraction:
The queue is in the belly of a cruise ship that has run aground. Over the intercom, the captain informs us, the passengers, that lifeboats will be taking us to a nearby island.
The lifeboats are simply yellow flume boats similar to POTC or Small World. We are taken across an "ocean" (this could be an indoor or outdoor attraction) to the mouth of a river leading into the island.
Past the beach and Into the jungle we go. We hear whispers. Perhaps we even see a figure of Jack's dad, dressed in a suit, facing away from us in the distance. He disappears before we can get a good look. We see trees being jostled, and hear the familiar low "whistle" of the monster (as heard in the pilot episode). Creeeepy.
Eventually, we see that part of the island has been hit by some sort of storm which has revealed a previously unseen DHARMA station. Our boat *drops* down into the entrance of the damaged, partially flooded station. In there we see computer equipment floating around. Perhaps we even hear the familiar *beep* *beep* *beep* of the Swan Station computer. Or maybe we hear Danielle's eerie distress call message. Even creepier, maybe we hear a distress call from one of the Losties we know and love (this all depends on how the show ends, of course).
We leave the station and return to the jungle, where we are attacked by the smoke monster.
After more misadventures, the ride ends with a massive flume drop, similar to Universal's Jurassic Park ride. This, of course, would be the ride's biggest draw for non-fans of the show.
I think that a good mix of scary effects and beautiful scenery would make this a popular attraction for fans and newbies alike. Notice that this is sort of a haunted house-type concept, rather than a story-point-by-story-point attraction like Peter Pan. Whatever the "secret" of the island is revealed to be in 2010 would of course play into the story of the ride. Considering that few people know the inspiration for Splash Mountain -- Song of the South -- yet enjoy the ride anyway, I don't think it's a stretch to consider that a LOST attraction would be successful!