Just about 30 minutes North of Anchorage you will find Lake Eklunta in the Chugach State Park. It has a very nice camp ground, but it is ideal for day walkers/visitors as well. The scenary is spectacular and there is a glacier at the far end of the lake. That would be an all day walk or maybe a bike ride. No elevation changes as you follow the lake shore on a prepared trail. But you can enjoy the view from the parking area or walk in as little or as much as you like.