Just got back from Dingle and thought I would pass on a couple of things.
We stayed in an AirBnB in Castlemaine and that was perfect - great base camp for Dingle, or Kerry or Tralee.
When we went it was very foggy/rainy and WINDY. My wife kept asking locals if it was always thins windy and they all without a beat said "what wind". :) So keep that in mind. It did affect our views but we still had a good time.
Maybe I missed in the RS book but a lot of stops along the require a charge - typically 3-5 Euro but it can add up. Some had animals you could feed for a few more.
Re: the ring fort at the 11.1 km mark in RS book - due to the erosion you can't really see much of the fort. If this is the only fort you can see it might be worth it but the ring forts on the Ring of Kerry are FAR better.
The nearby abandoned cottage - well, true to its name it looks pretty abandoned (but still you have to pay to see it). The mannequins inside really need to be replaced. The few signs are unreadable. Clearly it was set up for tourists years ago and then, well abandoned again.
Out of the Blue is small and unassuming (and you need a reservation) but was awesome for dinner.