Every Saturday there is family skating on the lagoon complete with music and hot chocolate. Even if you don't have skates it's a nice place for a scenic walk
A popular Anchorage destination Flattop Mountain is an all abilities destination. You can either look at the views of the city and Turnagain Arm from the viewing area near the parking lot, take a relatively flat walk on the Powerline Pass trail, or take Mara with you to climb the mountain!