Rachel,

There are a couple of other tour companies that do the Gap of Dunloe:

Gap of Dunloe Tours
Killarney Day Tours

But Dero's gets good reviews.

You can also drive throuh the gap if you are adventurous and don't mind extremely narrow roads. However, I don't recommend doing that in season or from the direction of Kate Kearney's Cottage. The jarvey's don't like it. I drive it from the Moll's Gap/Black Valley entrance, exiting at Kates.

Michele