Why Rent a Car in Iceland?
Iceland has limited public transportation outside of Reykjavik (Reykjavik). Buses connect a handful of towns along Route 1, but schedules are infrequent, and many places (hot springs, remote fjords, highland tracks) are only reachable by car.
A rental car lets you stop wherever you want, adjust your itinerary on the fly, and avoid the per-person cost of guided day tours, which adds up quickly. For two or more travelers sharing fuel and rental costs, self-driving is almost always the more affordable and flexible option.