This past June, I visited Dublin, Ireland.
I decided to try two different day tours.
1) Wild Rover Tours: I visited Kilkenny, Wicklow Mountains & Glendalough.
This was a fantastic day. Kilkenny - our guide gave us a great walking tour! Had about another hour and 15 minutes to explore. It was raining something fierce, so we didn't stop at the Wicklow gap photo stop (that was okay with me, and I am use to rain living in the northwest, but this was like buckets!). Then the rain stopped when we arrived at Glendalough, one of the first monasteries in Ireland. We had a tour of the grounds snd then could go on this fantastic walk around two lakes. We had about 90 minutes for this. If you didn't do the walk, there was a nice area to enjoy a snack or drink. This tour, I felt it was very well done, plenty of time to see and do everything. We even had a bonus, a sheepdog demonstration. I believe there were 48 people on the tour. Big bus, I actually had a free seat next to me. This tour started at 7:45 am and end after 5 pm.
2) Extreme Irish Day Tours: The tour I took was called Celtic Boyne.
Visited quite a few places: Trim Castle, Hill of Tara, Drove thru the city of Slane, Monsterboice (2 very old and beautiful Celtic crosses and a round tower), Tomb at Loughcrew, and brief stop to see the Newgrange tomb from the outside, and an hour visit to the town of Drogheda. So interesting to go into the Loughcrew tomb. Only thing I didn't like was the town of Drogheda. The church that we went into was interesting, but there was nothing after that. There was an included walk by a local. I did stay with them for about 15 minutes. To be honest, he was a sweet man, but I was falling asleep. I spent the remainder just walking on the main street and I got an ice cream.
This tour had about 40 people. I believe we started at 8 am and finished by 5 pm
An added note: A year ago, I was also in Dublin for a few days. I explored Dublin and had one day free. I booked a long day tour with Wild Rover tours to the Giants Causeway. We left very early, 7:00 am and arrived back after 7 pm. We stopped in Belfast. People had a choice of either visiting the Titanic Museum or taking a Black Taxi Tour, this was included in the tour price. I decided on the taxi. It was very interesting. Recommend it. Then, we visited the Causeway - fantastic. Please note, that this tour company doesn't pay for the visitors center. I didn't need go in either. I had brought a sack lunch and ate it on the basalt rocks. Our next stop, was a photo stop of a castle. Final stop the Carrick rope bridge - this was also included in the price. It was a long day, but very worth it. I wasn't sure if I would have a chance to ever go to Northern Ireland, so taking this day trip was definitely worth it!
This tour had between 40-50 people on it.