We have done this a couple of times and it is a lot of fun. It has become very popular, so you have to actually choose what hour you want to tour the lights. We have driven inour own car and used their Jolly Trolly on different trips. The Trolly was fun if you have a fun group that likes to sing, but it entails another line to wait in to load up.
There is also a big Christmas shop that sells ornaments (we though them very reasonably priced) and food. You can decorate your own cookies (for a fee) and do some other crafty things. There is Santa to visit and get pics with. You can buy their photo package, but they will be happy to let you use your own camera as well. We really enjoyed it, Saturdays are quite crowded. The price includes a day pass to the gardens as well, so we spent the whole day. Their bird of prey show is quite good.