Whether you would hire a car would depend on your day trip destinations.
San Vito Lo Capo is a seasonal beach resort town, a tourist destination, but it is genuine.
San Vito Lo Capo’s tourist season begins the end of May, and June isn’t as crowded as July or August.
Because San Vito Lo Capo is located an hour’s drive up Sicily’s northwestern headland, it isn’t well positioned for touring and exploring the attractions of Western Sicily. A base in San Vito Lo Capo adds an additional two hours of driving each day.
You might spend several days enjoying the beach, and then move onward to Trapani for touring the sights. Trapani has the best public transport connections in Western Sicily.
There is no train station in San Vito Lo Capo.
San Vito Lo Capo’s public transport connects via Trapani with the exception of the Russo bus to Palermo. AST runs the bus service between San Vito Lo Capo and Trapani.
There are several options between Palermo’s airport and San Vito Lo Capo.
Interbus runs direct service from Palermo’s airport to Trapani. Then take AST from Trapani to San Vito Lo Capo.
Otherwise, take the Prestia e Comandè bus from Palermo’s airport to Palermo.
Click on “Aereoporto Falcone Borsellino – Palermo”:
Then take the Russo bus from Palermo to San Vito Lo Capo.
There are driver services you could also hire between Palermo’s airport and San Vito Lo Capo.
Enjoy Lo Zingaro from San Vito Lo Capo.
Erice and Segesta are Western Sicily’s top destinations. This earlier thread discusses many more attractions in Western Sicily.
Where to stay in Western Sicily?: