We used Newmarket Travel and flew direct from Norwich airport for £499 each for a day trip. A long day, but perfect. An added bonus is the requirement for zero luggage. DS and I had one rucksack between us with hats, scarves and snacks.
Honestly, you don't need more. We didn't feel rushed, and it gets dark at about 2pm so you have the initial "ahhhhhhhhhhh" as all the lights and lanterns come on, but an hour later, you realise, actually we can't really do any activities because it's dark.
From memory, (about 6yrs ago now)
Landed, taken to cold weather outfit cabin and fitter with boots, trousers and jackets.
Sledging and little ski things for the little ones to scoot about on.
Hot chocolate and gingerbread from Mrs Claus.
Husky drawn safari (this was brilliant)
Lunch in the cabins. All decorated in Scandi Christmas style.
Snowmobiles out, went tearing off with DS, he still recalls this as when "Mummy went James Bond"
Getting dark now. All the cabins light up, all the trees light up. Actually stunning. If you're lucky you'll get a bit of the northern lights.
General mucking about in the snow. By now, you'll have made friends with others there and snowball fights commence, the children build snowmen. It's all wonderfully twee and Victorian Christmas-esque.
Reindeer drawn sleigh ride into the woods to Father Christmas' cabin. It's pretty hard to top this. It's done so well, and is the actual Father Christmas, in Lapland, according to DS.
After that, we topped up with some tea and hot food snacks, and had about another hour in the snow before the day ended.
It was quite a leisurely day, I know it sounds like a lot was crammed in but it was quite the opposite, and you need to understand there's literally nothing else to do, you are completely isolated in effectively a snow desert. How people string those same activities out over a 3 or so day trip is beyond me. There were moments where DS was bored, because it's cold and dark, but not many.
We've got more DC on the way, and I will without fail be replicating this trip with them, definitely as the day trip.