No way. Even by car you can't do this.
You need 2 nights in any given area/venue. Travel distances are long and slow. Taking public transport in the central area is not the way to go-
1- Why are you going to a very touristy, small beach , and very developed area with a small park in Manual Antonio? You have some the nest beaches and wildlife/nature on the caribe side. Avoid MA, period.
2- Monteverde is 4 hours from Arenal and 5-6 hours from Quepos, thats via car or shuttle, via bus would be all day.
3-You need 2 nights in Tortuguero, 3 is best.
4- If you are going to Drake Bay, which is great, I would put this first. Fly in and boat/bus back, or vice versa.
5- You do need reservations in Tortuguero and Drake Bay, these are remote location with limited lodging options, not easy to get around to look for a place in DB, as its is no town.
6-Arenal Volcano is not active.
7- What about rafting the Rio Pacuare on caribe side, via San Jose or Pt Viejo? Its a top 10 rover in the Americas and gorgeous and fun to boot.
8- You need to consider either renting a car for parts of this, or using shuttles, about $55PP per leg.
9- Interbus for Arenal and or to Tortuguero from Arenal. Shuttle Osa from Jaco or Quepos to Sierrpe, for boats to DB, or vice versa.
10-Focus on the Caribe and DB, thats the best nature/wildlife and bio diversity in the entire region and country.
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