When to rent a car?

Hi guys!
1st of all, thank you so much for the amazing tips! I am planning a trip in Feb to Costa Rica and your blog has been my best friend in the last hours 🙂
We really wanted to rent a car in Costa Rica – at least for some days due to budget constraints – but I don’t know if it is compatible with our itenerary… Can you please have a look and help me with this?
I’ve checked on your partners website and for a different drop-off place there is a minimum 3 days rental – so I guess the option of taking it just to arenal for 1 day is off… As as you said in other posts that the road to Monteverde is quite rough, I’m having second thoughts about renting it at all… are the views worth it?
I am sharing a summary of our plan with you, if you could have a look at it it would be perfect!
Thank you so much!
Day1 – Head to Arenal, day for hotsprings and waterfall
Day 2 – Go to Rio Celeste
Day 3 – Rio Celeste
Day 4 – Head to Monteverde (arrive noon)
Day 5 – Monteverde
Day 6 – Manuel António NP (arrive noon)
Day 7 – Manuel António NP
Day 8 – Drake Bay and Corcovado NP for 4 and 1/2 days
 
Cheers,
Ângela