We recently look a little trip down to Plymouth Meeting to check out the Legoland Discovery Center at the Plymouth Meeting Mall!
The drive from the Lehigh Valley really was super easy and I would certainly go back again, my kids refer to it often and they enjoyed themselves. I would like to make plans to stay longer next time, especially since the admission prices are a bit steep. If you have a lego obsessed kid you can do memberships to the facility which give unlimited admission for the year.
I've heard feedback from people that they thought it would be larger or have more to offer, I didn't feel this way. I thought the attraction had about what I would expect to see. There was a lot to do even if your child isn't really into Legos (mine aren't).
If you visit please let us know by leaving a comment!