For this itinerary, renting a car is recommended to allow for flexibility and convenience. Estimated travel time between destinations is 1-2 hours. Car rental costs vary depending on the provider and type of car, but budget around $60-80 for the day.
If you have more time, consider adding a visit to Manuel Antonio National Park or spending an extra night in Arenal to fully explore the area. If you have less time, consider skipping the hot springs and spending more time at La Paz Waterfall Gardens.