14ft TP trampoline, one of the best things I have ever spent money on, already had ten years of children wearing themselves out on it, the frame has a brilliant warranty, and spares are easy to get. Good quality pads, nets and really good bouncy jump. off in a corner, with bamboo in planters around it, so you can't see it, ferns planted underneath, large netting around the bottom so dogs and children don't go underneath.
Swings in trees, ropes and wood, dens in the woods.
two massive deep ponds (one wildlife, one fish), made from cattle troughs (concrete and plastic), dug into banks, with a large domed hole cage over the top, so children cannot fall in,they have had hours of fun.
frogs, toads, newts,(control all the slugs and snails in the garden) something new is always happening in the ponds.
four very long treated 9 by 9 posts, set into the ground deep/ hardcore/concrete, with industrial eyes in, up and down the post, set far apart, slightly squishy square shape.
used for hammocks, rope lines, poles, nets, hanging platform, seats, all sorts of things get hung between them, ever changing, used by children and adults. few ropes and heavy duty carabiner,
it's an ever changing activity centre. which can swap from child activity to adult with a couple of clicks, check farmers merchant or builders for cheap big posts. farmers merchant for eye bolts(go all the way through), cheaper than an activity centre, but useable forever, and far more versatile.
loads of raised fruit and veg beds, with lots of things that can be picked and eaten straight from bed, so the children always get involved with the garden.
I'm in a hammock now watching the dragon flies zipping past, hoping the family take their time getting home.