My wife and I have traveled to Costa Rica several times and found that cities and hotels in Costa Rica can be hit or miss. Amor de Mar in Montezuma is a definite hit. The grounds are beautiful and the price is not bad. There is a gorgeous lawn in front of the ocean with multiple hammocks and chairs that are perfect to lounge around in. We've stayed at this hotel twice, and the second time made sure we had time set aside to just simply lounge around the grounds of the hotel.
Montezuma is also a great little city. Multiple dining options and plenty of opportunity for excursions such as hiking to the waterfall, surfing, ziplines, etc. The city takes a bit of travel to get to, but I've found the time taken to get there is well worth it.