sitting here bored and was reading a few posts about how fast some of the chicas can convert dollars to colones and vice versa. It's actually very easy, I know people have there own ways but this is 2 easy steps.
From colones to dollars double the colone amount and drop 3 zeros
Ie: 30,000 colones, double it 60,000 colones, drop 3 zeroes $60
42,000 colones, double it 84,000 colones, drop 3 zeros $84
Reverse it to switch it back
Ie: $60 add 3 zeros, 60,000 colones, divide in half 30,000 colones
etc etc
Sorry, too many years dealing roulette and craps kicked in...you spend your downtime thinking of keys to figure out payouts when you are bored
Hope this helps!
FYI This is based on 500 per dollar but any amount around there will get you very close