The resort is fantastic - not much to add there. A couple of additional things:
The grocery store is about a mile up the road was very nice. It was well stocked with local fruits and vegetables, and other items you'll want for the week.
We took a tour at the Carara National Park; and contracted a local gentleman to guide us through the park. He was well worth the cost - he located animal life - howler monkeys, birds, toads and frogs, spiders, and other things that we would have passed without ever noticing. We also enjoyed a fresh caught fish at a local restaurant that was awesome.
Another hightlight was a chocolate tour; We learned a little biology, chemistry, history. It wouldn't have been complete if we didn't get a little taste testing.
The trip to Tortuga Island was awesome! I can't recall the cost, but the concierge at the hotel will take care of you. The all-inclusive day included drinks, lunch, snorkeling, and an :45 - 1:00 boat ride to the island.
The city of Jaco is nearby, but overall, we were not impressed by the shops or the beach in that area. We ventured out to a couple of other towns as well, but driving is not for the faint of heart; GPS works, but the fastest suggested route didn't always appear to be the safest due to narrow roads, winding roads through the moutntains, and potholes.