My personal favorite was the Disneyworld portion of the set up, with the Magic Kingdom castle and monorail. Caleb informed me that he is going to take me there one day. If they only knew we're going in a few short months and they will find out on Christmas morning!
While I wouldn't recommend driving a far distance just for the train garden, if you're going for food to it's definitely worth the trip. For $13.50 you can get a chicken dinner that includes a whole rotisserie chicken, 2 sides, and 4 pieces of cornbread. The crab mac & cheese is fantastic (but nowhere near healthy).
Richardson's Farm is located on Ebenezer Road in the White Marsh/Middle River Road. For detailed information visit: http://www.richardsonfarms.net/
P.s. Cost of the train garden=FREE (though they are taking donations for Johns Hopkins)