Based on the information you have given her on what you know about running a holiday site, renting out your home and flipping a property, it’s a hard no.
You need to do a lot of independent and informed research on all of these things. If you are asking on social media you aren’t doing that.
First thing I would do is visit the facility and talk to the people doing the work there at the moment. Don’t tell them you know the buyers and find out the truth. If there are similar places nearby talk to the people running those sites. Get the real picture on actual pay and conditions from them. The new owners can promise the earth but when it comes down to it, won’t pay what they can’t afford.
What about your children’s education and future. It won’t be swallows and Amazons for them until they reach eighteen and head off to Oxford. Tourist areas might be wonderful for tourists and retirees. But they are often economically blighted for young adults. Find out what life for them will be like.
Renting out your property won’t be a definite profit making exercise. The opposite is closer to the truth. You are likely to break even and then pay CGT when you sell. Speak to other local landlords and research the costs and risks.
Flipping properties is not like homes under the hammer. They quote the profit based on listed prices and before taxes and fees. Factor that in and the profit disappears. And people don’t pay a developers premium for amateur finishes. Again you need to research the business opportunities for this by speaking to local developers and agents.
Bank shifts are not easily available in all parts of the country. And you may be hit with the problem of them being available in school holidays and at the weekend. Talk to the local employers about opportunities.