I finally got around to reading Midnight in the Garden of Good and Evil in 2013, and my motivation was my impending trip to Savannah. The book was fantastic, and inspired me to visit the Mercer-Williams house while I was in town. Though it isn't the best tour I've ever been on, it's certainly worth the $12 and 30 or so minutes of your time.
To purchase your ticket, head around to the carriage house (in back of the main house - around the block) and enter the gift shop. Here, you'll also find plenty of little knick-knacks and some general souvenirs. Though the people who run the shop were lovely, the items I purchased aren't exactly of the best quality. A dish town shrank significantly the first time it was washed, and the fleur de lis bottle opener (yup, I'm that tacky) is already rusty. Oh well.
The tours run every hour or so, so you may find yourself with some time to relax. You may walk around town, browse the shop, or head upstairs to have a seat out of the heat. When the tour starts, you'll be called downstairs and ushered into the main house's back yard. Here, you'll see some beautiful plants, the fountain, etc. I do agree with other reviewers in that a bit more could be done to make this section of the tour really stand out. But, oh well - you're here to see the house, not the yard!
In you go. The main hall of the house is stunning, and you will be provided with history on everything from the beautiful black and white tile to the place settings in the dining room. The guides definitely do not cater to those who are here because of the book "Midnight in the Garden of Good and Evil," and in fact present a pretty one-sided story about the events that unfolded. We were told that Williams shot Danny "in self defense, and he was aquitted." If you've read the book, you know that this description definitely glosses over quite a bit of backstory - but oh well.
It is true that you are not permitted to take photographs, which is a disappointment. The tour also does not take you upstairs or downstairs, so you will not see the kitchen or the ballroom. However, what remains on the main floor is beautiful, and the house itself and absolutely gorgeous. I would recommend this tour, but be sure you go in with all the knowledge that has been provided in these reviews.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.