When we're done eating, we usually grab a seat on the bench or swing which is on the grass right at the fence. The kids like to hear the pilots over the radio and wait for them to land.
Weekends are a good time to go because there's more flight activity but it's harder to get the "prime" seats on the patio!
The food at Plane Jane's is yummy....we LOVE their pizza. And my son thinks they have the best chicken fingers around. Definitely go check it out....the kids will love it!
PS. If you're a letterboxer...there's a box there! =)