Mt. Vesuvius is a very historical active volcano, being the volcano that destroyed Pompeii and also being the battle ground for Spartacus against the Romans. The views up Mt. Vesiusvius are pretty epic and is really worth the hike.
Paht of the Gods is an epic hike that takes you along the stunning Amalfi Coast. The hike isn't particularly difficult and can be completed by people of all ages and fitness abilities. If you are lucky you might some wild mountain goats.
A walk in Cinque Terre National Park from one of the five towns Monterosso al Mare to Punta Mesco which offers a vantage point of the five towns and the coast.