I'm going the first 2 weeks in June. Can't speak much about cigars over there, but I do intend to visit the Peterson pipe factory/store. I've heard if you give them plenty of advanced notice, they'll show you around the factory.
Also, Aer Lingus offers direct flights to Dublin from Denver every Friday (not sure if that is very relevant to your location, but just fyi). You might want to start your plans sooner since July is peak tourist season. Also, start booking stays now. Easy to cancel and rebook with zero fees if you see better deals.
Edit: if you got the coin and want to fly first class, book in economy first, then upgrade. Will save you a few hundred bucks.