This isn't an expansion and there's no price yet, but it includes 50 new playable Sims, 15 new decoration items & six new outfits.
Inspired by Aspen and Lake Tahoe in the summer
There's a "royal" family (the parents are Leaders of the Free World) complete with dashing son and rebellious daughter who ran away to the woods to become a hippie. Then there's old Grandma Shue with all her adopted children, a Cinderella-inspired family and a wacky journalist with a bright pink house.
There's also a Fountain of Youth. If you can find it (it's tucked away pretty well), your Sim can drink from it and that will prevent aging for 24 hours. You can also take a chance and wish for youth, which will freeze you at your current age if you're a young adult or transform you back to a young adult if your Sim is older. It won't work every time though, and you run the risk of one or your Sims traits being switched to Childish (a.k.a. they'll act like a fool).