we have a house/climbing frame i got if from ww/kidsoutside.co.uk its been a fantastic purchase, had it two years? now and the elder three play on it everyday, it has a slide, a climbing wall, a rope ladder, a knotted rope and a regular ladder to get up into the 'house' on top and there is a sandpit underneath, it actually is squarish so doesnt take up loads of space in the garden.
we also have a little tykes play house, given to us by someone who had outgrown it, wouldnt buy one through choice, but the littles one does like it
a see saw, that is well used by the youngest two who are 3 and 5.
then all your usual ride ons, scooter, bike, tractor, trike, etc etc
but the climbing frame/house is the most well used and loved by kids of all ages, from when they are wlaking up to ten years old