Just to offer a slightly different point of view. My dh works for an outdoor centre, and the last year has been brutal. The staff have been furloughed but there's a huge residential centre and big grounds to maintain, and very little government help.
Last summer it was briefly possible to offer day activities but really very few schools wanted to come. This year, there have been lots of schools who had booked activities for the summer (some, but not all, deferred from last year), but now the DfE have said residentials are permitted from May, they are all just rushing to cancel!
Some schools have admitted they hoped the DfE would forbid them to go, so they could reclaim their deposit. Now the schools have decided they don't want to come anyway, and in most cases are just demanding their deposit back anyway. Sometimes they blame the parents for not wanting to send the children, other times they say it's the head teacher's decision.
In most cases they won't even switch to day visits - it's just a straight refusal, and by the way give us our deposit back now or we won't book for future trips.
The outdoor centres have spent huge amounts of time and effort in making everything as safe as they can. Adapting activities, children in bubbles, safe transport, cleaning regimes, eating in sittings, ventilation, disinfecting equipment....you get the idea.
Ultimately if parents don't feel confident, they won't send their children. I get that. I'm a parent myself. But also, the centres might not be there next year. That's not said lightly - things really are that bad, financially. Maybe that's just inevitable. But could people maybe consider day visits? Surely children need just these sorts of activities this summer