What if it turns out to be a nice warm sunny day and you like general aviation. You could go to White Waltham. I flew a Slingsby and a PA-28 out of there with an instructor several times. Or you could just watch(and see if you can peek at the interesting aircraft in the hangars) and grab a snack at the flying club or...........
.....spend some real money on a Spitfire ride at Biggen Hill(or just take the very good tour of their facilities and watch other people paying for Spitfire rides).