The most popular hike in Kachemak Bay State Park is this 3.5-mile, one-way trail that begins at the Glacier Spit trailhead, near Rusty Lagoon Campground. The level, easy-to-follow trek crosses the glacial outwash and ends at a lake with superb views of Grewingk Glacier. Camping on the lake is spectacular, and often the shoreline is littered with icebergs (and day-trippers).
At Mile 1.4 you can connect to the 6.4-mile Emerald Lake Trail, with a hand-tram and access to the face of the glacier. If you don’t have time for the entire hike, there are excellent views less than a mile from the tram.