Here is the rain water lake. Apparantly the water is cold 13-14 degrees celcius
We spent a few hours driving to Poas Volcano. It was very close to us as the crow flies from our mountain home but it was literally 2 hours to drive there because of the road access. It was a beautiful day in the mountains, but when we first saw the crater it was filled with steam and clouds, so it was a "nothing but white" view. Luckily as we hiked around the mountain we ended up being there long enough that we got to view the steam coming off the crater lake that is kept at 40 degrees celcius from the volcanic activity in the mountain.