[Don Ro]

Don't impose/intrude...expand your universe to include the possibility that what you want from him/them may not be reciprocal.
Send them a card welcoming them, just one line...add your phone # stating that they're free to phone you if any noise from your area bothers them.
Then mind your own business/stay outa his face/give the guy his privacy.
I exchanged phone #'s w/all my neighbors for security/neighborhood watch purposes...but I don't interact w/them.
I like it that way.

Edit: I wave 'n chat some, but don't attend block/yard parties, etc.