Funny thing.
I always seem to get more respect from local merchants when I count out the exact change needed for a purchase. I don't quite understand why, but certainly the taxi drivers are (probably unpleasantly) surprised when I give them the exact fare shown on the meter (when I can get them to run it.
Also, as noted above, the coins are great for tipping of all kinds. Example: There is a large plastic jar on the bar at the SL, and it's a great home for those pesky 10 colones, 25 colones and 50 colones coins, as well as higher denominations.
The 10 colones coins are useful for making local pay phone calls.
You can shut up a street beggar and maybe even avoid a robbery by carrying a pocketful of small coins. If you are approached by a group of beggars (potential mugging threat) just scatter a handful ofcoins on the sidewalk as you pass. The beggars will descend on the pocket change likes sharks on chum.
