I'm going back in 2019, first trip was in 2015. More firepower this time, and will probably 'invest' in longer glass as well.
We are staying in Santo Domingo for three nights (near San Jose) to 'acclimatise' to CR and our hotel has an amazing garden. Then to Savegre (for the Quetzal), Carrara NP (coastal pacific), Arenal and La Selva. Early May 2015 was WET!, subsequent years the tour had better weather...