Hi Thomas,
I’m in a developed area, Tamarindo, with cable Internet. A lot of areas have similar service, even pretty out of the way spots. Although there are still some areas where cable is not available. In those cases, I’ve heard of people getting a satellite connection. Another alternative is a “mifi”/3G/cellular data connection since there are cell towers everywhere. I know Movistar, a local cell provider, offers a little antenna you plug into your laptop via USB to get online. Of course, speed is an issue with that.