I'm just wondering what all of YOU have for 'outside'....

I have 4 kids, ages: 8mos, 2, 2.5 & 3

I have a swing set - w/ slide, seesaw, 2 regular & 1 baby swing.
A riding car, 2 bikes, a tunnel, a mini-slide, kids picnic table, a chalk/magnet easel, legos, 'camping' chairs, 4/5 soft foam sport balls AND bring out bubbles once in a while.

Why...oh WHY do they just stand there looking bored?? Am I missing something? **My DD isn't an issue, she's the opposite - I have to tell her to stop **

The baby is easy....with the others I encourage catch and fun chasing, races, soccer, looking for birds or flowers etc.

Tips? Advice?