Orange,
I did just the trip you reference in your post. Last Sept, the FORMER fiance' and I rented an SUV and had a "interesting trip" to Arenal. Interesting on many levels, I will just touch on a couple here.
We rented from Tricolor.. I found them to be most hospitable. We were staying at the Adventure inn. I imagine you probably are familiar with the Los Arces area, (near the Huge Firestone Factory). Well the rental car folks delivered right to the hotel.
I believe this is a service they provide for many other locations.. I am not positive on that though.. The rate was about 35 a day for the mid sized suv... No taxes, total cuenta. Unlimited mileage. They had cheaper , yet smaller suv's available, whatever is your fancy... The vehicle was in pretty decent condition,, ran well. AC cold.
The atttendant and I went over all of the cosmetic issues and we both initialed a carbon copy backed receipt.
Now the trip to Arenal is simply beautiful. The road is not. Let me just go off a minute. I was so damn stressed by the time I reached La Fortuna that I most likely overreacted to a very Stiff and unhelpful staff at Tabacon Springs. (beginning of the end for me and the near Mrs.)
The road from San Ramon up to Arenal is decent in spots, and Damn scary in others. Do not do this at night!!!
The road is very narrow in areas, many blind turns with Buffoonery abounding. This aint Kansas Dorothy. Also it is quite easy to take a wrong turn in a couple of the pueblos..
Now if your chica is familiar with the ride, and you are able to repress that inherant New Yawkar in you, you will most likely enjoy the trip.
I strongly recommend against Tabacon however. They were the MOST customer service ignorant upscale hotel I have ever (and Never again) stayed at in my 44 years. Simply put, a bunch of JERKS!
Of course, YMMV and I am sure others as well.
hope this helps
BTW, Tricolor does provide a Bitchen Map, its even water resistant!
Phone number in Paseo Colon is 257-4455
tricolor@racsa.co.cr
El BB