Biking is a reasonable option to get around town and reach some of the top tourist attractions. The challenging 7km ride from town to La Catarata is a classic. Make advance arrangement to rent a bike from Bike Arenal and they’ll drop it off at your hotel.
La Fortuna is easy to access by public transportation, but nearby attractions such as the hot springs, Parque Nacional Volcán Arenal and Laguna de Arenal demand internal combustion (or a tour operator). If you’re thinking of doing a day trip to Río Celeste, Caño Negro or Venada Caves, you might also consider renting a car for the day.