The advance party includes TV crews, security services and a taskforce of cleaners.
But the villagers of Trearddur Bay on Anglesey are already getting used to rubbing shoulders with Prince William, who brings his fiancee Kate Middleton on the couple's first official visit to Wales on Thursday.
There is mostly a sense of excitement that a touch of royal glamour is putting the coastal getaway on the map to a new wave of tourist.
"We're all looking forward to it. I'll be going, of course," said Karen Knight who works in the village Spar shop.
"I've had a lot of phone calls off people from all over the island asking what time can we expect to see them tomorrow. I'm hoping it will be nice and busy for them.
"I think their effect on Anglesey is wonderful. He's been seen out and about and they say he's fabulous and mixes with all the locals.
"My sons have seen him a couple of times out having a meal in a local pub."
As a fund-raiser for the local RNLI, Kathryn Eastment has an official invitation to see the royal couple - weeks away from their wedding - launch Trearddur Bay's new lifeboat.
"He was approached because he is at RAF Valley and as the helicopters work in close co-operation with the lifeboat," she said.
"I think it's a really appropriate thing for him to do and a gentle way of introducing Miss Middleton to the way of life she going to have to get used to.
"I'm looking forward to possibly meeting them. I think it's superb for Anglesey. It's put us on the map.
"I had an email off a friend in America who asked if I knew they were coming."
One Trearddur Bay resident who wasn't aware of the visit was Wyn Roberts.
"I didn't know they were coming and don't care to be honest. I won't be going to see them," he said.
As for his feelings about the royal couple spending the first years of their married life on Anglesey, he said: "It doesn't really bother me."
Stephen Peters, who works in his family's garage in the village, has been interested to see the preparations going on.
"You wouldn't believe it; they've had these road cleaners from the council," he said.
"I saw two yesterday and another two today going down the road with jet wash machines. I've never seen that in Trearddur Bay before.
"They really have been tidying up the area. It's never dirty here, not much litter, but they've been going mad - they've even steam-cleaned outside the shop, and I don't think they'll be going in!"
Stephen says the couple's presence has created a real buzz.
"A lot of people have been talking about it and will be visiting tomorrow," he said.
"The children are off school and my niece wants to go; they're excited about seeing a prince.
"They've been seen around here in Tesco and the cinema in Holyhead, but people tend to leave them alone.
"I've got a friend who runs a pub in Valley and Prince William has joined in on the quiz."
Robert Byrne, a Scot who retired to live in the village after serving as a pilot at RAF Valley, was delighted to have the couple in the area.
"If it brings even a little bit of glamour here, it's good - it is a great place though and the people are wonderful," he said.
"I think it's jolly good they're coming because he's at RAF Valley and does a job that's worthwhile.
"He's got a very nice girlfriend and they're more than welcome here. Locally they love it. It's great."