A day trip to Dublin to visit Trinity College, the Book of Kells and the Archaeology Museum is a wonderful idea!
Thanks to Gary for some advice on the public transport option from Trim, a good idea if you want to avoid driving completely.
As the places you wish to see are on the south side of the River Liffey, the best place to park would be near Trinity College. While there is no parking available on campus, they have some advice on where to park
that would be worth taking a look at.
The Hop On Hop Off bus
is a great way to see around the city. The route is a circular pattern and the stops are outside of all of the main attractions such as Trinity College. If the weather is fine, a walk around the city may be the best way to get around.
Is there anywhere else in Dublin that you would like to see during your day in the city?