While My Wife and I were in Hawaii celebrating our 10th Anniversary we took a Lost tour with the company KOS Tours Inc. http://www.hummertourshawaii.com/page/1111465 It was awesome the tour guide Jeff showed up in a Hummer and drove us around downtown and pointed out where Desmond & Charlie drove into the water in the Flash Sideways, the Marina where Ben shot Desmond, The interior & exterior (shot in different locations where Christian ran into Sawyer, the church where Desmond's Monistary & Daniels Oxford were shot. We returned later to try and find some of the locations which are in a later post.
Then we went up the Nuuana Pali Drive and we stopped at the place where They filmed the outside gate of Anthony Cooper's Home. Jeff told us that the small guard house was added just for the shot and then taken away. We weren't able to take pictures during the begining of the tour so I don't have photos of this.
After that we drove on the Nuuanu Pali Drive and stopped along the side of the road and he told us to look closely across the road because that area was where they shot the scenes when Ben & Locke visited Jacob's Cabin, Eko's death, where the Smoke Monster killed the Pilot and the tree where Hurley ghost whispered between Richard & Isabella. He told us that the film crew had cleared the area to film the scene and that Jeff and another tour guide had later visited the place after the episode aired and everything had already grown back. Thing grow that fast in Hawaii.