Making Sure to Get a Hotel with Parking

I am trying to plan a trip to Ireland, and I could really use some tips. First of all, I need a good website for booking Ireland hotels. I need to have a list of the different amenities available at the different hotels so that I can make sure that the hotel where we decide to stay has parking. We are going to have a rental car since we want to be able to drive around a bit outside the cities and see a bit of the country. I know not all of the hotels, especially in the big cities, have parking available.