That would be a tossup for me, because I have two. KBFI-because its a neat approach into the airport, you always see some really unique aircraft there, and Galvin Flying Services is 'well staffed'.

KBKL- Burke Lakefront airport, its kind of a 'mini' Meigs field (down with mayor daley), beautiful city view on a nice day, and you get to fly directly over the stadium of the 2010 super bowl champions on short final.