Giant's Causeway Tour

No — a public right of way runs to the stones and you can walk down at any hour without paying. What is ticketed is the National Trust Visitor Experience: £16 adult, £8 child, £40 family, free to members, cheaper outside June–August. That buys the exhibition, a guided tour, the shuttle bus and the car park. The catch for drivers is parking — without a Visitor Experience ticket the nearby car park is about £15 per vehicle, so the free option is really a £15 option unless you are dropped off. Coach passengers sidestep the whole question. Full detail on the tickets page.

Worth it if you are driving, arguable if you are not. For a driver the £16 includes the car park that would otherwise cost £15, so the exhibition and guided tour are effectively an extra pound — an easy yes. On a coach tour you already have transport and often ninety minutes on site, which is enough for the stones themselves; the centre then competes with your time at the columns rather than adding to it. The exhibition is genuinely well made and explains the geology properly, so it comes down to whether you want the context or the coastline.

Belfast, by a lot — about ninety minutes against nearly three hours from Dublin. That difference decides the shape of your day. From Belfast a half-day tour is possible, morning or afternoon, from around $32. From Dublin it is a twelve-hour commitment and operators pack the route accordingly, adding the Dark Hedges, Dunluce Castle and Belfast — which is why the leading Dublin tour at $93 carries 9,749 reviews despite the drive. Compared properly on the Belfast or Dublin page.

Just over a kilometre from the visitor centre, about ten to fifteen minutes downhill on a paved path. There is a shuttle bus if the walk back up is a problem, included with a Visitor Experience ticket and a small charge otherwise. The path itself is easy; the stones are not — the columns are uneven, frequently wet and genuinely slippery, and that is where people turn ankles. Proper shoes matter more here than the distance suggests. See the walk and timing guide.

Ninety minutes covers the stones properly, which is what most coach tours allow. That is the walk down, time on the columns, and the walk or shuttle back. Add an hour if you want the visitor-centre exhibition, and half a day if you intend to walk the clifftop path towards the Shepherd's Steps and back — which is the better walk and almost nobody on a tour does it. If you are driving and the weather is good, the site rewards a longer stay than any itinerary gives it.

Early morning or late afternoon — the coach tours cluster in the middle of the day. Because access is a public right of way, early and late visits are actually possible in a way they are not at ticketed sites, and the columns in low light are far better than under midday flat cloud. In summer the site is busiest between roughly 11:00 and 15:00, which is precisely when the Belfast and Dublin coaches arrive. If you are driving, going against that pattern is the single biggest improvement available. See the timing guide.

The Causeway coast and the nearby Dark Hedges were used extensively as filming locations for television, and several tours are built around them. The Dark Hedges — an eighteenth-century beech avenue near Armoy — is the single most recognisable of them and appears on most itineraries as a short stop. Ballintoy harbour, Cushendun caves and Murlough Bay are the other regulars on this coast. Dedicated location tours from Belfast run around $32 and carry 1,556 reviews on the leading option. See filming-location tours.

Yes for the stones, and increasingly not for the parking. The right of way means the site itself never turns anyone away, at any hour. The constraint is vehicular: the visitor-centre car park is included with a Visitor Experience ticket and fills through the middle of the day in summer, and the alternative car park charges around £15. Visitor Experience tickets are booked online with arrival slots, so if you want the exhibition on a July afternoon, book it rather than arriving hopefully.