What are your favorite outdoor toys for your young toddler? Slide? Ball pit? Water table?

DD is 17 months old and stands by the door saying "OUTSIDE!" all day long. The only problem is that once we get out there, there's nothing for her to do except run around the yard. I'm looking for some good outdoor play stuff for her.

She has a swing at my parents' house that she loves, but a huge outdoor play set isn't in the cards for us right now. Looking for semi-portable (like, can put in the garage when it snows), low maintenance (I'm also pregnant, ha), super fun toys for her. Bonus points for links!