Often naked at home (like now!), and outdoors whenever possible in warm weather.

The first thing I do in a hotel is strip down naked. The freedom and privacy is the best. Plus, I think about the guys before me who spent time stroking their cocks in that room always gets me hard.

I do this as well. In fact, I am typically semi hard just checking in. 

As far as your question - how do you keep your hands off? - i do not try to and would ask - why try? It is just plain too much fun