A coastal run between two Portuguese towns looks ideal by car until you price the rental, the motorway tolls, the fuel and the parking that costs more than lunch. The intercity coach covers the same distance for a fraction of that, runs several times daily in summer, and drops you within walking distance of the old centre rather than on its edge.
Coaches reach the centres that cars cannot
Historic coastal towns were built before vehicles, and their streets are narrow, steep and often restricted. Driving gets you to a car park on the outskirts, then you walk anyway. Coaches and local buses stop near the centre, which means the vehicle you paid for spends most of the trip parked and idle while you cover the interesting ground on foot.
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Book seats a few days ahead in July and August, when weekend services fill. Printed timetables are unreliable out of season, so check the operator's site rather than a photo of a board. In shoulder months some routes drop to two services a day, which makes the morning departure the only practical option.
A car and a coach trade different kinds of freedom
Compare a car against a coach on the stops you actually want. A car wins for a beach with no bus service, an inland village, or a viewpoint twenty minutes off the line. A coach wins for point-to-point travel between towns, where it is faster, cheaper and lets you look out of the window instead of at the road.
Practical move: build the trip as coach legs between towns, then hire a car for one or two days from a single base. That captures the remote stops without paying for a vehicle every day. Return the car at the same office and continue by coach, so you never drive into a city centre.
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Coastal timetables change with the weather

Winter storms occasionally suspend coastal services, and rural routes can be cancelled at short notice. Keep one flexible day in the itinerary and avoid tight connections to a flight home. A coach that arrives three hours late is an inconvenience mid-trip and a disaster on the last morning.
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