if he's long distance then getting something in the mail would be a nice surprise.  My girlfriend got me a whiskey subscription when I was living in a different state and it was awesome to know she was thinking about me when we were far apart.  I think she used www.tastersclub.com

This isn't for any special occasion, it's "just because". I want to get him a spontaneous gift that he'll love. 

I was thinking about a trip somewhere with activities that won't be physically demanding. (He had knee surgery fairly recently)

About him: He's a typical IT guy and he loves flying (simulators and occasional seat time)

Please help!

Looking for a gift for my long distance boyfriend