pear try your local forest school for some plastic-detox time!
I wouldn't just abandon the sand/water trays - my boys couldn't care less some days but other days they'll spend a good half hour at least shovelling sand around.
I didn't send Calf to nursery today. I used the heat as an excuse.
He asked at breakfast time if we were going anywhere today & I did tell him that normally it would be a nursery day but that I thought he'd like to stay home. He chatted happily about how the other children would be having packed lunches later & playing outside but there wasn't a hint of disappointment that he wasn't going. If he had been upset I wouldn't entertain the idea of not sending him back next term but he cries when I tell him he's going & seems perfectly happy when I keep him home. Seems daft to send him somewhere that upsets him, costs the government money & is just a hassle to fit in now that his other friends are starting nursery on different days. If I don't send him then at least we'll have more freedom for doing playdates when it's convenient for other people. He interacts with other children so much better when there's only one or 2 so I think it would be better for his social development if we didn't send him. Seems bizarrely counter-intuitive but I think it might work for him! 
We went round to a friend's house yesterday with a total of 9 under 4s. Calf tried to hide in the lounge initially but did eventually come out to play. There were 4 similar aged boys there who paired up & Calf did his own thing until 4 children left. That just left him & 2 older boys, Calf & a baby. The 3 older ones, including Calf, spent ages jumping on the trampoline together, lying down, jumping over each other... Calf was actually playing with other children. I've never seen him playing like that for more than about 30 seconds before! I was ridiculously proud!
I got the paddling pool out for them in the afternoon. I spent ages pumping it up & filling it so that there'd be an hour for it to warm up a bit before they got in... within a minute of being in the pool Runt did a poo. Once I'd filled it up again they had a whale of a time splashing around. Took Calf about 20 minutes to sit down in it though - I made them wear t-shirts & he was freaking out about getting it wet. Eventually he slipped over & had no choice about sitting down. After that he was fine! While I was getting dinner ready I can see them from the kitchen I got Calf watering the plants & Runt sat happily in the pool watching him... Except the shade came over the pool & the wind picked up & he got really cold. I thought it was odd that he wasn't joining in with Calf so went & checked on him - he was shivering! 28 degrees & his lips were slightly blue-tinged from cold!
I asked him if he wanted to get out & he whimpered "yeah, bees" & shuffled over to me. I had to cuddle the cold, soggy boy until he stopped shaking enough for me to go grab the towel but he still refused to let me take his soggy t-shirt off! I pinned him down & pulled it off in the end but he still wouldn't relinquish the towel until I put his food on the table. He was just dragging it around after him. Seems to be a developing theme with him - he's got an infatuation with my PJs & whatever I take off in the morning will get dragged around the house by him! 
bring wish I could hide from my DC like that - they always find me in less than a minute! I just have a stair gate across the lounge & have taken to shutting myself in when I need a moment to breathe! They know exactly where I am but can't get to me! Mwahaha... 