Please consider the following precautions during your trip, that are the same wherever you travel around the world:
Do not leave your luggage unattended at the airport or with a stranger, do not carry any stranger´s luggage through customs or immigration, and always carry your money within an inside pocket or a body pouch, or money [...]

Costa Rica has a bus system that offers inexpensive, timely and convenient transportation in the Central Valley. It is the primary means of transportation to natives.
On the countryside, sometimes buses do not run frequently, in some places they operate only once a day. Another possibility is arranging transfers with tourism transportation agencies [...]

Many people love driving and visiting the country at their own pace. Car Rentals are available from the major rental companies. To rent one you must be at least 21 years old, have a valid driver’s license and a major credit card.
Gasoline is available at stations throughout Costa Rica, most are open 24 [...]

Most banks are open from 9:00 a.m. until 3:00 p.m. and do not close for lunch. Credit cards are widely accepted, with Visa, MasterCard, Dinners and American Express being the most popular.
Government offices are open from 8:00 a.m. until 4:00 p.m. Most commercial business open from 8:00 a.m. until 6:00 p.m. Stores and other [...]

What is the time zone in Costa Rica?
Costa Rica is the same as U.S. central standard time, but does not observe daylight savings time.
Is there a good communication system?
Direct-dial telephone service, facsimile, telex, radio and cable television are all available. Bilingual operator assistance for international calls is: 116, local information: 113, long distance information: 124. [...]

A pocket-size English/Spanish dictionary, a small first aid kit, binoculars – camera and film, walking shoes, sunscreen, traveler’s checks – cash or/and credit cards, swim suits, casual clothes for nightlife and fine dining, insect repellent, copies of your favorite Costa Rica travel guide, sandals – sunglasses & hat, necessary medications, rain jacket, passport/birth [...]