This 179km circuit of the Iveragh (pronounced eev-raa) Peninsula winds past pristine beaches, medieval ruins, mountains and loughs, with ever-changing views of the island-dotted Atlantic, particularly between Waterville and Caherdaniel in the peninsula's spectacular southwest.
The smaller but equally scenic Skellig Ring, which spins off the loop, is less travelled as the roads are too narrow for tour buses.
Centred on the Ring, the 700-sq-km Kerry International Dark-Sky Reserve (www.kerrydarksky.com) was designated in 2014. Low light pollution offers fantastic stargazing when skies are clear.
If you want to get further off the beaten track, explore the interior of the peninsula – on foot along the eastern section of the Kerry Way from Killarney to Glenbeigh, or by car or bike on the minor roads that cut through the hills, notably the Ballaghisheen Pass between Killorglin and Waterville, or the Ballaghbeama Gap from Glenbeigh to Gearha Bridge on the R568.