Heading there next month and trying to finalize the itinerary. Going to be there for 14 days mid-January. So far it looks like this:
Day 1: Arrive evening in SJO. So only thing is restaurant and bars.
Day 2: Rafting Pacuare.
Day 3: Drive to Manuel Antonio early morning. Spend the day surfing and seeing the town.
Day 4: Drive to Puerto Jimenez. Base camp for Corcovado hike.
Day 5-7: Hike Corcovado with 2 nights in Sirena Ranger Station.
Day 8: Drive to Jaco early morning. Spend the day surfing and seeing the town.
Day 9-12: Drive to Tamarindo early morning. Spend 4 days.
Day 12-14: Leave Tamarindo early morning. MONTEVERDE or ARENAL?
Day 15: Fly back home.
The main thing was to go rafting, hiking, and surfing. Day 12-14 is open and undecided. What is more of a must see... Monteverde cloud forest or hot springs/waterfalls/volcano in Arenal? Both are on the way back to SJO. So it made sense to see at least one of these wonders of CR.