Editor’s note: Since we posted this entry, Panama has begun enforcing its immigration and visa laws more tightly. Officially, it’s no longer feasible to do a “quick” border crossing in order to renew your visa. Rio Sereno and San Vito are still worth a visit, though! With three months under our belts as Panamanian expats (where the heck did the time go??) we’ve passed a new milestone – our first border run. Everyone who enters Panama gets a tourist visa good for 180 days. But driving is the catch for people like us who are here for the long haul and don’t yet have a permanent residency visa. Although we have another 90 days to play tourist, we’re only allowed to drive with our California drivers’ licenses for the first 90. Soooo – to remain legal drivers in Panama, we had to cross the border into Costa Rica, spend the night, and then come back…