This was easily one of the highlights of our trip to NOLA! We wavered on which plantation to visit and I am so glad that we chose Oak Alley. The house and grounds are stunning! I worried that it might be less impressive in person, but the pictures just don't do the estate justice. We drove past several plantation houses which looked interesting, but they seemed to lack the magnetism and sheer presence of OA. If you only have time to see one plantation, I highly recommend Oak Alley!
After a leisurely time at the plantation, we drove over to the swamp. The drive is long, as other reviewers mentioned, but it is completely worth it. We paid the extra for the small airboat, which holds up to 6 people, and it was worth every penny; not only because it was insanely fast, but very maneuverable so we were able to see lots of wildlife. We also lucked out and had the best tour-guide. Captain Dewey was absolutely, simply incredible... like the Steve Irwin of the bayou. He was extremely knowledgeable, funny without being over the top, and a total delight. We got to hold Billi (his baby gator) and then after several large gator encounters, we went off-route to go baby gator hunting. Because our airboat was so small, we were able to get into parts of the bayou that the larger airboats couldn't. We had a magical time, and still think about how much we learned. Really, Dewey was amazing!!!
Bottom line, if you have a day to spend while you are in the area, DO THIS TOUR! You won't be sorry!