Most, if not all those listed in the transportation section will do any taxi jobs including short trips around town. I won't get into the route taxi option as that is a topic unto itself.

Opinions vary regarding money and ATM's. Some simply take enough cash for the trip and then exchange at local cambios. Others prefer to use ATM's exclusively while some use a combination of credit cards, ATM's and cash. Each method has it's advantages and potential drawbacks. I personally bring enough cash only as a backup in case there are ATM issues along with a credit card as a redundant last resort. Search previous posts for PLENTY of discussion on both topics.