An island the size of a small county can be far harder to move around than a mainland region twice as large. Water, roads and timetables do the constraining, not distance.
Ferries are the schedule everything else obeys
Where the only link is a boat, its timetable becomes the framework for the whole trip. Every other plan must fit between crossings that may run only a few times a day.
Frequencies also vary sharply by season. A route with several daily sailings in summer may drop to a handful a week outside it, which changes what a short visit can cover.
Crossings are weather-dependent in a way road transport is not. A cancelled sailing can strand a traveller for a day, so tight onward connections carry real risk.
Island roads are longer than the map suggests
Coastal roads follow bays and headlands rather than the shortest line, and mountainous interiors force routes around rather than through. Driving distances routinely exceed straight-line distances by a wide margin.
Surfaces and width matter more than length. A single-track road with passing places sets a pace that has nothing to do with the speed limit.
Estimating island journeys at mainland speeds is the most common planning error, and it is the reason ambitious day trips run out of daylight.
Vehicle availability is a genuine constraint
Hire fleets on islands are small, and in high season they sell out entirely rather than merely becoming expensive. Booking on arrival is often not an option.
Taking a vehicle across on a ferry needs its own reservation, frequently well ahead, and vehicle space sells out before passenger space does.
Where a car cannot be secured, the alternative is a trip designed around one base and public transport, which is a different itinerary rather than a compromised version of the same one.
Bus networks serve residents, not visitors
Island bus timetables are usually built around school and work journeys, which produces early morning and late afternoon services with a long gap between them.
That shape suits a visitor going out for the whole day and frustrates one wanting a couple of hours somewhere. The return service may simply not exist until evening.
Sunday and off-season reductions can remove routes entirely, so checking the specific day rather than the general timetable is the step that prevents a stranded afternoon.
Planning outward from the crossing works better
Building an island itinerary from the ferry times backwards, rather than from a list of sights forwards, produces a plan that survives contact with the timetable.
It also identifies early which places are realistically reachable and which require an overnight stay, converting a vague ambition into a decision made before departure.
Travellers who do this consistently see more, because they spend their time in places rather than in the transitions between them.