Have you been down to Costa Rica? I've got a place in Playas del Coco that has availability during that time frame.
Depending on your style, there's plenty to see and do in the overall area, relax at the pool or the beach, scuba diving, and deep sea fishing, among other things.
Fly into Liberia (LIR) and it's a short 30 minute drive/shuttle to Playas del Coco.
I know you mentioned it's just you and your wife, so my place may be a little bigger than you're looking for. My condo sleeps up to 6 with 3 beds and a pull-out couch. With 2 bedroom, 2.5 baths, private terrace, and one of the condo's 6 pools located right outside the front door, you'll quickly find yourself surrounded by the "pura vida" vibes.
If you choose to stay local and not rent a car, the area is extremely walkable, with the closest restaurants and convenience store located short 2 minutes away. The beach is only 3-4 minutes away, and the main strip of town is a short 10 minute walk.
The first time my family and I stayed there, we spent a month there and never rented a car (we did Uber a few times for big grocery trips/going up to Playa Hermosa and down to Playa Ocotal for a change of scenery).
https://www.airbnb.com/rooms/1282678568317453381If you're interested, you can either book through airbnb, or let me know the dates and I'll give you an Aggie Special rate.
cocosunsethills56 at gmail