Peak to Peak is a great ride.
However, consider Trail Ridge Road. From Loveland, CO go west on US 34 into Estes Park. Straight through Estes Park on Main St. to the entrance to Rocky Mountain National Park. Trail Ridge Road goes through the park to Grand Lake.
From Grand Lake continue on to Granby and Winter Park. Over Berthoud Pass to I-70. Take I-70 East to Denver and I-25 North. I-25 North back to Loveland.
You will never regret it. Every mile is spectacular.
One tip. Do NOT buy gas in Grand Lake. Fill up in Estes Park and again in Granby. There's only one gas station in Grand Lake and they charge a LOT more for gas than anywhere else. It's almost robbery.