Dont miss the beauty of Zion National Park. This is a must see while you are in the area. Zion is absolutely breathtaking with many hikes of all lengths and difficulty. The best time to visit is in the spring or fall, but the park is accessible all year round. Be careful of slippery trails in the winter and bring lots of water in the summer. Shuttle buses take you to various trailheads from March through November.
Website: https://www.nps.gov/zion/index.htm