Bonjour Olivier,
It's great that you are planning a visit next June! 🤩 Especially as a big
Vikings fan!
First of all, you can definitely reach the Wicklow Mountains using public transport from Dublin.
St. Kevin's bus is great for that, as it brings you straight to
Glendalough (the heart of the Wicklow Mountains National Park)
Speaking of Lough Tay/Luggala Estate (please note that the grounds of the estate are
private property), it becomes a bit trickier without a car. You would have to get off before Glendalough (
at Ballianastoe Golf Club) and arrange a transfer with a local cab in advance (
Glendalough Cab). You could also hitchhike (it's just a 5 minutes drive from there) or even walk if you feel like it.
Another option would be to go on a half-day tour that stops in Lough Tay, amongst other locations. You can find such tours departing from Dublin with
Paddywagon for instance.
Have you got anything else planned during your time with us? If you like the vikings (not just the TV show but the actual ones), you can check out
these suggestions.
Let us know what you think!
A bientôt,
Antoine