Extra day to burn

Thanks to everyone who contributes so much valuable CR travel info .. it's helped us immensely. Our trip plans are: 4 days Playa Flamingo; 4 days Montezuma; 4 days La Fortuna. We have 1 extra day before flying from Liberia. We'll be spending our final night in a hotel close to the airport. My question is this: because we have an an extra day in between La Fortuna and Liberia, would you suggest we spend a fifth night in La Fortuna, or is there another 'one night' destination that we're missing? One that would still enable us to get to Liberia for that final night in a hotel prior to our flight. Thanks one and all.