Tips For Learning Costa Rica Spanish
Learning Costa Rica Spanish: Avoid Sounding Like a Gringo 

In Costa Rica and Central America a gringo is usually defined as a U.S. citizen, but can refer to any foreigner. Most Gringos stand out in Costa Rica by the way they dress, social customs, behavior and common errors they make when speaking Spanish.

If your goal is to sound like a native Costa Rican speaker and not be viewed as a foreigner, try the following suggestion:

Learn the correct Spanish vowel sounds. Most English speakers “stick out like a sore thumb” because they don’t know their Spanish vowels. Learning the correct vowel sounds can make a world of difference.
Also practice rolling your r’s. Remember that an r at the beginning of a word or two r’s together are pronounced the same - much like a car purring.
The d between vowels or at the end of a word sounds more like the th in ‘thus’ than the English d. Nada is pronounced ‘natha.’
Both the c and z are pronounced like the English s. But c is pronounced like a k before a, o or u.
The double ll or y are pronounced like the y in ‘yes.’
In Spanish, the letters b and v are pronounced almost like the English b.
J is pronounced as an h. ‘H‘ at the beginning of a word is silent.
Spanish requires more spoken formalities than English so you should make every effort to say “hello”, “good-bye”, “good morning”, etc. Skipping over these formalities will label you as a foreigner.
Avoid using “yo-ismos.” Instead of saying yo quiero say quiero or creo instead of yo creo. Most native speakers eliminate “yo” unless they want to emphasize the subject of a statement.
Try to learn as many idioms and useful phrases as you can. Like English, Spanish is very idiomatic. Most Spanish courses don’t teach you these handy phrases.
Also, learn the proper gestures that Spanish speakers use.

Spend as much time as you can with native Spanish speakers. This will help you learn Spanish like it’s really spoken and to become familiar with all the necessary social customs.