Pacuare Rafting Tours sells the Pacuare as a day trip or a two-day expedition from San José, picking up in the capital rather than requiring you to base yourself in Turrialba, and also runs trips up to the Tortuguero canals.
Being San José-based makes them convenient for a single big day out of the capital, which is how a lot of people fit the Pacuare in.
The same company sells Tortuguero under a separate brand and website, with the same booking number, so there is no need to deal with two operators if you want both.