Is this like Pokemon-Go? That need reality place and we must go to the specific place to catch/earn something special? I hope the quest will be based on local location on a country, because if it too far, will make someone desperate because of doubt about a long journey.
You are right.
We really want to promote local interactions.
No need to go too far for different reasons :
1) you'll meet easily someone near your location
2) the interest from the partners of Enzyms (cafés, meeting places,...) will be higher if they can attract people from the area (they will maybe come again).
3) You'll want to do it when you have 30 minutes free; not take a long day for one mission and meet max one people.
Maybe the idea of a longer trip may be considered for big events with a lot of people.