Originally Posted by
planemechanic
This is what I have been doing for years. Just remember to keep some local currency if you need it for exit fees, taxi rides to the airport, etc...
Very important tip!
A few years ago when leaving Bangkok we used up almost all our Thai currency to pay down the hotel bill, but didn't have enough left for the departure tax at airport checkin, had to convert more USD to Baht at the airport!
And whatever residual you have left over, use it to buy some small snacks, candy, etc. in the departure area to have handy during your trip. Also, for leftover coins, many international airports have donation bins for them where proceeds go to local charities.