We chose to go with Desafio Adventure's class 3/4 rapids based on user reviews and they did not disappoint! We boarded a bus with a group of giggly teenagers on a group trip and a four 20-something passengers, which made us us the bus elders. The rain was pouring over La Fortuna, however we drove two hours to the Sarapiqui River, which was a little less wet. It didn't matter though, we were about to get thoroughly soaked!
At the river, we met up with a another tour bus and the crew started inflating the rafts. We threw on our gear (helmets & life vests), grabbed an oar, divided into groups and went through a safety briefing and quick tutorial with our guide, Jorge. Thankfully, Chris and I were on the boat with the four 20-somethings - making us a group of six, plus our guide. Later we learned that, had we been on a raft with the lanky teenagers, we would have been rescuing them from the water the entire time! They regularly fell out of the boats because they collectively weighed about a hundred pounds.
Here is a picture of our tour bus, shortly after we arrived at the river: