Reception Ideas for a very small, simple wedding?

Neither of us have very many family members...or friends. I was wondering what we should do for a wedding reception because obviously we aren't going to reserve a whole banquet hall for just 18-21 guests. So I was wondering what some of your ideas are? A hotel or park maybe? Is this hard to reserve for yourself? Can you get catering for that low amount of people? Any creative or just helpful advice would be appreciated. Oh and how much would a hotel be if we were to use their business conference room? 10 points for most detailed answer. Thanks!!