Birds, fish, wild flowers and thick trees. Nature at its best in the middle of the italian most developed region. 100% recycling, no cars allowed except for moped (many unluckily) and small buses. Bikes everywhere. No possibility to bring your own car on the island.
That's enough to dream of a better world starting from here.
One of the most pleasant activities is definitely walking along the coast path and linger on one of the many benches listening to the sound of nature. Of course, the lake is generaly not comparable to the sea, but here it's almost impossible to resist bathing in the apparently clean water. As an alternative you can go trekking up to the monastery - the highest point of the island.