If you have your own canoe or kayak, stop for a paddle on Skilak Lake, located in the Kenai National Wildlife Refuge. For a quick hike with good views, go down Skilak Lake Road, past Hidden Lake campground, to Skilak Lake Lookout Trail. Get a glimpse of Skilak Glacier and look out over the lake. You can be up and back in 1-1.5 hours. Up for something longer? Here are two good day hikes:
Depending on time, tackle the Skyline Trail. Right off the Sterling Highway, you'll see a sign on the side of the road at a pullout, about 2-2.5 miles past the Skilak Loop Road turnout. Though just two miles round-trip, the trail's elevation gain (1,800 feet) pushes your hike to a good five hours. Still, the views of Skilak Lake and the Kenai Mountains are spectacular.
Right past Cooper Landing, cross two bridges (the second above the Kenai River) to get to the Resurrection Pass Trail. It's about four miles in to beautiful Juneau Falls. There's some elevation gain in beginning, but switchbacks keep the difficulty down.