One mile of sand. Blue water. Blue skies. It doesn't get much better than Headlands Beach State Park in Mentor, one of the longest beaches in Ohio and certainly the longest and cleanest in Greater Cleveland. The park is free, although you might want to bring money to rent a windsail. Also, take time to check out the dunes at the far eastern edge of the park. The area is actually a nature preserve, open for inspection during daytime hours.