"We want to plan what to see on our free time and after the tour ends."
Rick provides this information, but for some reason hides it. (I've written to this website asking them to make it more prominent, to no avail).
If you go to your tour, then scroll all the way down to Pre Tour Planning, then open that and scroll down again, you'll see the following:
Sightseeing on Your Own
If you arrive in Ennis before your tour begins, use the Rick Steves Ireland guidebook to get oriented. Wander the city center, join a day trip to the nearby Burren, try a pint in a cozy pub, and get over your jet lag with lots of fresh air and exercise.
If you plan to spend extra time in Dublin before or after the tour, here are suggestions for sightseeing that we will not be doing as a group: Kilmainham Gaol (book in advance), "Hop-on/Hop-off" bus tour, National Gallery, Dublin Castle, Dublin Writers' Museum. For details and other possibilities, see the Rick Steves Ireland guidebook.<
If you have further questions, call or e-mail the Tour Department directly, at firstname.lastname@example.org or 425-608-4217.