The fact there aren’t many places to cycle longer than 10 minutes without hitting lights, crossroads or traffic; one looks for roads and routes which add some excitement, distance and variety. There are a few options, the tried and true cycling routes and then there are international routes.
To train indoors or not? Training outdoors is easy if you have good weather, good group rides, good terrain available and a bunch of spare time. If you are at a loss for time, terrain or group rides you might find yourself somewhat forced to train indoors.