Sicily first route: east-only or full loop?
Choose the east-focused route. Ten days is enough for a satisfying first trip, but a full loop risks turning it into a chain of transfers, especially without a rental car. Aim for two main bases, add a third only if the connections genuinely work, and leave room for arrival, departure and one slower day. You will see less of Sicily on the map, but you will have more usable time in each place.
Full answer
Verdict
For ten days, keep the trip east-focused rather than attempting a full loop. That is the more realistic first route, particularly without a rental car. A loop may look efficient on a map, but every extra base brings another check-out, transfer, check-in and round of luggage handling. The result can be broad coverage with very little time to settle anywhere.
Two main bases are the sensible default. A third can work, but only when it fits cleanly between the other two and does not depend on a fragile connection. The aim is not to collect stops. It is to finish the trip feeling that you actually had time in Sicily.
Build the ten days properly
Do not treat ten calendar days as ten uninterrupted sightseeing days. Arrival and departure take a share, and changing bases consumes more time than the journey alone. A practical shape is to use the arrival day to settle into the first base, give each main base several nights, and protect the final night from an awkward last-minute transfer.
From each base, choose a small number of priorities and treat anything else as optional. Day trips should simplify the route, not become another way of spending every morning in transit. If an outing requires several separate connections or leaves no comfortable fallback, it probably does not belong in a short first itinerary.
Without a rental car
The east-focused choice becomes clearer when you are relying on public transport. Before fixing accommodation, check current connections between your proposed bases and for any day trips you consider essential. Look at the complete journey rather than a single departure: where it leaves from, where it arrives, how many changes are involved and whether the return leaves enough margin.
Keep the route linear where possible. Doubling back to retrieve luggage or reach the departure point adds complexity without adding much to the trip. It is also worth choosing bases for their usefulness to your route, not simply because they look evenly spaced on a map.
If you are hiring a car
A rental car gives you more flexibility, but it does not make a full loop automatically worthwhile. Driving still takes time, and each additional overnight stop still breaks up the day. Keep the east-focused plan unless driving itself is central to what you want from the trip and you are comfortable accepting a faster pace.
If you do add another base, be blunt about the trade-off: identify what it replaces. Do not simply bolt it onto an already full plan. One extra stop should mean fewer day trips or less time elsewhere.
What you give up
An east-only route means leaving part of Sicily for another visit. That is the real compromise, and it may feel unsatisfying when planning. The payoff is fewer transitions, more flexibility and a better chance of absorbing the places you do choose. For a first trip, that is usually the stronger bargain than tracing a complete circuit.
If seeing the whole island matters more than depth, a full loop remains possible as a deliberately fast-paced trip. Just recognise that the recommendation changes from relaxed exploration to coverage, with less room for delays, weather changes or spontaneous stops.
Check current details
Before committing, check current public-transport timetables, driving conditions, seasonal service changes and opening hours for any must-see places. Recheck close to departure, then keep at least one flexible block in the itinerary. If the transport needed for a third base looks awkward, cut the base rather than forcing the loop.