I love Mt. Vernon! It is a fun place to go for people of all ages!
First, I recommend booking your tickets ahead of time as lines to obtain tickets the day of could be very long. Booking ahead of time is the way to go. The tours of the mansion are great!
There are other fun things to see here besides the mansion. There are stables, some animals, a slavery graveyard, and Washington's tomb area. The gift shops here are also amazing!
The food court area here is very busy. It wasn't a bad experience...just busy and overpriced.