Been skating in Dublin all me life and would be happy to show you around one of the days, depending on your age.
There's some decent parks around. Bushy, Lucan, Clondalkin, Fairview, and Clongriffen are all pretty popular. Only one indoor park around at the moment which is in Tallaght on the Belgard Road.
For street there a good few famous spots like the book ledges, new spot 9, the trinity banks, and other random ones. Really depends on what you're into but there should be something for everyone.
For nightlife, it really depends on your age. Hangar, Opium Rooms, D8, Coppers, Diceys, Whelans, and Academy are all popular with younger people.
Enjoy your trip bro, Dublin's a sick place if you know your way around. Dunno if you can DM on this but hit me up if you've anymore questions!