I agree @Erik_Wahlstrom Costa Rica is generally safe to be out and away from the resorts but the drivers can be dangerous. Many roads don’t have much of a shoulder either. Depending on how long you’re going, I’d consider a gravel bike and go explore. Once you’re off the main roads, expect many dead ends, pavement that suddenly turns to dirt and steep climbs. Many of the types of roads I’ve been on would be better on a mtb.