Wow - some people can be so unimaginative about holidays - and comments about the UK being a "Waste of Time".....b$%^locks - grow up!
Living in the Highlands we are lucky as we can travel 2 hours west and have some of the greatest beaches in the UK. In 7 years doing this - and going north to Sheltand, Orkney, Western isles, Western Highlands - sleeping in camper van, tent, and now a cheap (£900) caravan - we have got wet, blown around - but mainly the sun has shone!!
Our boys have had experiences (walking through valleys and hills for picnics - cycling, paddling in boats, climbing over rocks fishing in rock pools) and have spent endless hours on beaches with distant observation by parents from caravan/camper/tent.
Fly kites, dig canals in the beach, build castles - float boats, have camp fires from driftwood, cook marshmallows, ride bikes, explore, go swimming in the sea (take wetsuits.....).
Kids play with other kids they find - or with each other - or with us.
There is typically no-where to buy stuff and limited stuff to buy - other than quality locally produced food - so self catering mostly with a treat meal out if we find somewhere good and worth it.
Typical cost is £20 per night, for all of us - we budget £250 for a week away - but then we own our cheap accomodation (which cost less than half of the cost of typical package week away in the Med) and we both muck in to cook (as at home).
We calculated the cost last year in Oct Half term (a friend was going and I was wondering....) - and came up with £2500 all in for a week in Majorca for the 4 of us, travel to Glas/Edin, Parking, flights and accom. I am sure you can do it cheaper but I reckon paying the morgage down by £2k is more imp to us - and we can get away 4 times a year during the various hols.
Hols with kids need some imagination - and some planning for wet weather however somewhere like Shetland - leisure centres everywhere - even in the smallest settlements - pools and jacussi to yourselves - people really plesed to see you.....;-) - The Highlands have over 20 pools too -
This year - we are touring England and Wales - hopefully for a Month (this is a one off big holiday to let the kids see some of things we did as kids) - will see if such a UK holiday is a "Waste of Time" too.
Yorkshire Dales, Tour de France, York, Leeds, Duxford, London, Hastings, Southampton, Pembrokeshire, Lakes and much more. Sounds grim for us and the kids......not. ;-)
(We already dismissed a £130 day out at Legoland - swapped for a Free day at the Science museum and sights of London.)