Arrange the western connections
The Dublin–Galway train uses Heuston. For Galway–Killarney, compare Expressway 51 to Limerick and route 14 onwards, checking the Colbert connection. The final Killarney–Dublin journey can require a Mallow change.
Book the coast and island day separately
Follow the current Cliffs of Moher access notice. A continuous coastal walk cannot be assumed. For Inis Mór, include the Galway–Rossaveel shuttle, boarding and ferry journey, and check weather before the outing.
Build the budget from nights and days
The day figures add up to €1,493.00 for one traveller before paid visits and extra journeys. A private-room line buys the whole room; divide only that part when sharing. These are chosen spending allowances, not available room offers or measured averages. Replace the stay amount with the full booking cost, including taxes and cleaning.
Add paid visits, excursions, intercity or inter-island tickets and airport journeys. The day notes separate accommodation, meals, local travel and small extras. The final day has no extra overnight allowance. The city budget cards are an alternative plan, so do not add them on top of this subtotal.