Hi Tyler.
Thanks for taking time to reply me and give great information. I really appreciate that.
Starting with my first question -
I am new to wildlife photography and since past one year or so I am taking more interest in this new region. So far, I was mostly into landscapes. And I am liking it a lot. But honestly, I am not there yet, where I would look and chase specific bird species. I am still on learning curve here and all I want is, to take lot of pictures of birds (and other animals too) on this trip. I made some rough notes and note down Tucans, Oropendolas & Parrots, Woodpeckers, Sloth, Basilisk, Honeycreepers, Woodpecker. Hope I can get most of them.
One reason to pick Laguna de Lagarto was, it was mentioned as best place after Osa to photograph birds, by one of my known fellow. And confusing part, for which I posted question, I will be staying 2 nights only. If I leave SJO in morning, I will reach there post noon. Laguna de Lagarto takes much longer than Sarapiqui area. Later I will do Cano Negro boat tour too and it is easier to reach there from Sarapiqui. Having said that, considering my days, if Boca Tapada really shines then I would go with that. If Sarapiqui can work for me and some feeder can do great job without long hike, I will chose this. Hope I am able to explain my confusion here.
Second -
After spending two nights at Laguna de Lagarto (or Sarapiqui, if you would recommend), next I will do Cano Negro boat tour. I read that those areas of wetland can give some good opportunities.
I will be staying 3 nights at Arenal and 3 nights at Monteverde. At Arenal, I wanted to book Arenal Observatory Lodge, but it is booked at my dates, so I booked Arenal Oasis Eco Lodge & Wildlife Refuge (it is cancellable, so I have option to choose other one, if availability appears later). Sector Peninsula, Papa's Place and Sky Adventures would be some options, as you suggested. Canopy San Luis also looks good. Reserva Manuel Antonio Brenes looks far for day trip from Arenal.
Not booked anything at Monteverde yet. I am still searching.
Thanks again for your help here.