48 hours in Dublin with a 12 year old

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We have a 2 night non-weekend trip in August, 48 hours of actual time in the city. Trinity College Library and Book of Kells is a definite. What else should we definitely do? We are staying v close to city centre, not in a hotel so suggestions of where to eat (including for breakfast) welcome. Cornucopia looks good? We would like to use one of the left-luggage places in the city on the final day - any recommendations?

My 12 year old loved the Hard Rock Cafe there. They are very good with kids and the memorabilia and live afternoon music make it quite interesting. We went in winter though - it won't be ideal if it's hot sunny day.

Kilmainham jail and the Viking duck tour are both time well spent.

I have used Tipperary House left luggage. Very secure. It is on the red line luas (Museum Stop) near Heuston Station.

Guided tour of Dublin Castle is quite interesting.

The little Museum of Dublin is quite quirky, it is near Stephen's Green.

Well worth doing the Open Bus Tour.

The leprechaun museum is great fun! And Dublin castle worth a look. Phoenix Park nice, including the zoo

Butler’s Chocolate Cafe has a few locations in the city.
If he’s into Vikings and history, Dublina is a fun museum as it recreates the streets of Dublin as they would have been during the Middle Ages. A full immersion in history, you can try on Viking clothes, visit a medieval kitchen and learn medieval games.
The amphibious Viking Splash tours are good fun. The tours leave from Stephens Green North, close to Grafton Street and last just over an hour.
Kilmainham Jail is great for older kids. Entry is by guided tours only which are operated on a timed-ticket basis and prebooking is essential.
The Guinness Factory is interesting and there are several interactive parts aimed at those under 18.
If he’s into sports, I’d recommend a tour of Croke Park Stadium, home of the Gaelic Athletic Association. Through guided tours you get to see the stadium in all its glory and learn about how the stadium and the sports it host are intertwined with the country’s history, identity and culture.
The Chocolate Warehouse runs regular workshops. A two-hour workshop involves a short introductory film, a demonstration and a tour of the machinery used in the factory, as well as a practical session of coating and decorating chocolates.

Thanks all.

Have a look at the Dublin pass - I think you get it cheaper if you order it before you go. It includes entrance to many things and can include hop on/off bus which we used as transport as well as sightseeing, and bus from airport. If nothing else it'll give you a list of attractions to consider.