The Horne Lake Trail was named after a big strapping Scot named Adam Horne who worked for the Hudson's Bay Company on Vancouver Island. After hearing stories of a trade route between Qualicum and the First Nations people of the Alberni Valley the company appointed him to investigate it. He was the first European to appear in the Alberni Valley.
Sadly, the historic route has largely disappeared from the landscape. But this route approximates it. The trailhead is located at the end of Horne Lake Road in the Cherry Creek area. It winds its way uphill to Lacy Lake through second growth forest and then along a power line. Lacy lake is a water reservoir for the people living in the Cherry Creek area. From there the trail continues upward following the powerline through a mix of young regenerating, and older forest. There are beautiful views along the way. Then the trail starts heading downwards toward Horne Lake arriving at the south end of the lake where there is a Regional Park and campsites. You might decide to camp overnight and take advantage of a tour of the Horne Lake Caverns while you are there. It is quite a worthwhile experience.
If you should decide to take a swim in the lake, dry yourself thoroughly immediately after you come out of the water. The lake is infested with swimmer's itch, a parasite of waterfowl that does not harm humans but can cause itching. Drying will sweep the parasites off your body.