Hi Roger,
I would like to heartily invite you to explore the Causeway Coastal Route, and the end of May until mid-June is a good time to visit as it is generally less busy than in July and August.
The route takes in coastal villages at the foot of beautiful glens. It hugs the coast, giving stunning views of cliffs and long sandy beaches, all waiting to be explored. Central in the route is the Giant’s Causeway, Northern Ireland’s only UNESCO World Heritage Site, with its hexagonal–shaped basalt stones and columns. Nearby is Ireland’s oldest working distillery where you can experience all the sights and smells in the production of malt whiskey, and even sample some too! East of the River Bann, atop the wind-swept headland at Downhill sits the Mussenden Temple, with breath-taking views in all directions. Discover more by browsing our Visitor Guide
http://www.visitcausewaycoastandglens.com/Portals/0/downloads/Causeway-Coast-And-Glens-Visitor-Guide-2017.pdf
The Causeway Coastal Route comprises A and B roads, and so should pose no problem to a 7m long motorhome. You do not need to do the very steep loop around Torr Head; just stick to the main A2 route between Cushendun and Ballycastle. It is generally best to avoid C roads and unmarked roads. There is the Black Arch at Drains Bay, just north of Larne, but that shouldn’t be a problem unless your vehicle is more than 3.8m high.
The Causeway Coast Way is a long walk between Ballycastle and Portstewart, but it is possible to tackle one or parts of its six sections. http://www.walkni.com/walks/186/causeway-coast-way/
You mentioned an interest in food. May I suggest you check out https://www.causewaycoastfoodietours.com/and https://www.irishfeast.com/
There are regular speciality markets showcasing artisan food productsfrom the area, and if you timed your trip right, you could catch the Salmon and Whiskey festival in Bushmills (16th - 17th June).
Let me finish with some information about campsites. http://www.visitcausewaycoastandglens.com/Caravans-and-Camping-A135
I hope all your plans come together easily and that you have a very pleasant trip around Ireland.
Kind regards,
Mary.