Let's start with what not to do...

DON'T:
Rub my nose bridge / facial markings - They are Airbrushed and do not want them to rub off.
Rub/scritch my bodysuit too hard. Same thing applies from about the facial markings. Most of the black spots are airbrushed and want to keep the suit as new as possible.
Roughhouse / tackle / in general don't be rough with me, fursuits are expensive.
Yank on my tail... That's kind of a no brainer.
Grind/grope on me in public... That's very frowned upon.

DO:
Take pictures of me. (Just be sure to notify me prior to for best photo ops) And please share them! ^_^
Hug me.
Pet me gently.
Talk to me.
Include me in silliness and general tomfoolery!
Invite me to parties! I love being social!