I think you're being too anal. Just tell your friend to use some common sense, stay low key, and he'll be fine. You know, don't go strutting around with a $2000 ring, and $4000 watch, type of thing. In general, people aren't going to give a shit about you.
Remember one day years ago, I woke up in Edmonton one morning, bored and stressed from work. Packed a bag of clothes, hopped into a taxi to the airport, and looked at the departures sign. Seen a flight for Mexico City leaving in a couple hours, and I thought to myself, "Aha! That's it, off to Mexico I go!".
Booked my flight, and 12 hours later I was in driving around in downtown Mexico City with a total stranger in his private car. He wasn't a taxi, but just some guy hanging out at the airport hoping to make some extra cash. Got dropped off at a hostel, grab myself a room, and wandered around a bit without the slightest clue as to where I was.
I was still in a little bit of shock due to my stupidity, and thinking, "ok, now what the fuck did I get myself into? 14 hours ago I was in Edmonton!". About an hour later I was in some plaza, doing tequila shots and smoking weed with the locals. Was a great night!
I woke up wanting a break from my daily routine, and that's exactly what I got, lol.
