Nationals of countries that require a VISA to enter Costa Rica are NO LONGER REQUIRED TO APPLY FOR THE VISA if:
You have a tourist, visa, crew visa or business visa (multiple entry) from the UNITED STATES OF AMERICA, CANADA, SCHENGEN VISA and / or any country of the EUROPEAN UNION. Note: This visa must be stamped in the passport and must be valid for a minimum of 1 day from the day you enter Costa Rica. The length of stay may not be greater than the validity of the visa and may not exceed 30 days.
То есть при въезде в Коста Рику примерно 20 ноября по визе США, действующей до 28 декабря, проблем быть не должно?