Geeky Yet Waterproof

Today we got up early as planned (9am??) we drove 2.5 hours into the country to a river in the mountains where we could go swimming. We had been aiming for a waterfall a little farther away, but the bridge was broken so we just stopped here.
There were already lots of people swimming in the river, even though it was slightly freezing. Cintia and Zi ordered some drinks and sat at a table while Cassio, Iza, and I got in the water and started swimming/walking/climbing up the river. The water was really strong in some places, and we sat down between rocks so we could feel the current. We eventually got to a big bowl of water where you could actually swim, and we saw people diving in or bombing down the rapids in an inner tube, so we stopped there and swam for a while.
We were too lazy to swim/climb back down the river to get back where we started, so we hiked on the muddy road to where Zi and Cintia were, and there we ate fried fish and drank guaraná soda.
On our way home, we stopped at a beach for ice cream, and then later we stopped at a little restaurant that was basically a canopy perched on a cliff, and ate tapioca.
When we got back to the apartment Iza and I went swimming in the ocean for a while, and later on when it got dark we hung out with two of her friends. It turned out that all of us could play guitar, so we made music on the beach until about 1am before everyone finally went to bed.