The diverse landscapes of Costa Rica allow for great outdoor activities like white water rafting and relaxing at the Tabacon Hot Springs. Explore the Arenal Volcano and view the fiery red glow from the summit. Drive to the Monte Verde Cloud Forest to see the exotic environment and pass through the city of La Fortuna.
Yes definitely bring US Dollars, i'm not sure they change for Canadian at the banks? But people like taxi drivers and small shop keepers will generally accept US Dollars as payment unlike the Canadian dollars