Metal set from Brave. Was scary expensive (compared to our usual spend), but has been used for a few years now - you can choose what to hang from the swing bar (swing (toddler, normal, extra wide, basket, flying), trapeze, rings, rope ladder, punch bag, hammock...), one leg has knobbles so you can climb, has fireman’s pole and a net about 4or 5ft up where DD sits and reads, rope ladder, etc. It’s not as visually heavy as wooden set as the frame is narrower. Got it when DC was 5 and still gets used a fair bit now as she’s 10, when she’s a teen I’ll use a hammock from the swing bar.
For me, the greenhouse! I absolutely love it, gets used year round (I don’t hear it in the winter though), you can make it as simple or complicated as you like (depending g on what you want to grow), so can always have some successes.
Comfy furniture is also lovely to have.
And a bird feeder IF you live somewhere without many cats.
And a pond or small water bowl thing. I’ve one that’s just big enough for a dwarf waterlily.