Formerly, the Immigration Authority granted a stay of 90 days per entry. Today, visitors must declare their intended length of stay if under 90 days there should be no problem. Thereafter, it is possible to apply to the Costa Rican Immigration Authority for an extension of stay (even if only for a day or two). The extension will attract a charge per passport of US$100- and is negotiable in length up to another 90 days.
The Blue River Resort & Hot Springs is one hour away from the Liberia International, Daniel Oduber, Airport (LIR)A. The airport is a scenic road trip from the Blue River Resort, they will arrange for the Shuttle Service to collect arriving passengers. It is the perfect ending to a long trip.
Do not overstay your allotted time without prior permission. It is so tempting sometimes.