I would have an idea of where I want to park beforehand (ie. GA parking / XYZ East / XYZ Handling) and then aim to turn off at the most convienient spot for that. If ATC (if there is one) ask, you can tell them where you want to park, if they tell you somewhere else, I'd query it with them, and if no ATC, but say a "Gound" freq I'd simply ask "where would you like us to park sir" or something along those lines....