Ford's Theater is run in conjunction with the Park Service. You need a ticket to get in, but tickets are free. On the July Friday I went, they had sold out, but you can reserve tickets ahead of time on Ticketmaster (you will have to pay a small serice fee). You can choose from several different options, depending on the time of your entry. I did just a walk-through of the museum and theater (they also have a 1-act play and ranger talks). The museum's in the basement. We had 25 minutes there, which was plenty for the small space. There were interesting exhibits on Lincoln and the assassination. Then we had a brief time to go in the theater itself. You can take pictures and get fairly close to Lincoln's box. Afterward, you can go across the street to tour the boardinghouse where Lincoln was brought after he was shot. I didn't do that part due to time constraints. In all, I spend about an hour there, and it was well worth it.