I'm an American now living in Waterville, on the Ring of Kerry. I'm adding this tip in case someone viewing this area of Rick Steve's Travel Forum (which is fantastic!) is planning an Irish trip in July!
On July 2, 2016 the 33rd annual Ring of Kerry Charity Cycle will be held. Over 5,000 - yes, FIVE THOUSAND cyclists will be riding the entire Ring of Kerry driving route in one day. They do NOT close the road to vehicles! They only close a small part - the area over Molls Gap - to vehicles. It's crazy. I know, I've done the cycle, myself!
So - unless you want to battle thousands of cyclists on the already difficult to maneuver on the "wrong" side of the road for Americans Ring Road ...... pick another day!
You'll want to see Molls Gap - it's an amazing view. Even if you book a bus tour, they will NOT be showing you that view, since the hill is closed to vehicles. Pick another day! I can't stress this enough.
Along the same lines, Killarney (the start and finish) is packed that weekend and it's almost impossible to get a room, and will be one of the most expensive times to be in Killarney. Rethink Killarney that weekend!
If you're seeing this and are interested in DOING the Ring of Kerry charity cycle, the on-line lottery for spaces closes on January 31st. See www.ringofkerrycycle.ie for details.
The Ring of Kerry area - the Iveragh Peninsula - is worth cycling any time of year! I know: I don't own a car, here, and cycle year round.
Enjoy!