Hmmm...can't really help you there, buddy. But it sounds fun. Be sure and let us know how it turns out. I'd do what you are, ask a bunch of like-minded folks for their advice. But then, you'll have to make-up your own mind about what to do.
I reckon you go for a 'relaxation massage'. You're dick will probably pop up during the session (mine does even in a sports massage) and go with it. Just see yourself as a 'Sexual Explorer' and head into the wilds of that massage parlor ready to see where it takes you.