ATMs are readily available except in the most isolated places. Credit cards are widely accepted at restaurants and upscale hotels but may be problematic elsewhere.
Restaurants Tipping should be 10%, but check to see if it's included in the bill.
Taxis Tipping is optional, but you can round up a dollar or two, especially at night.
Guides It is customary to tip US$7 to US$10 per person for day tours; tip on the high end for naturalist guides.