Coffees for me, have mostly been at a restaurant or coffee house. I have had the pleasure in walking the trail around the lake in Peachtree City. Every once in a while, I will meet at someone's office. Once at a power perk, one of the guys  used the "power park" protocol. Always business is discussed in an equal light and I always try to find out how I can refer/"help" the person I am talking with. The conversation flow is based on who is meeting. Similar to dating, if you feel uncomfortable, chances are your coffee will be awkward. I've noticed the time usually stays between 45min to an hour. I have learned it's okay to space out these meetings.