Thinking about a road trip next year, Las Vegas to Zion, Bryce, Grand Canyon and back to Las Vegas. Open to other suggestions in the area as well. Probably going to take about 10-12 days or so but am wondering about the middle of April (my daughter’s school vacation) or the second week in June (leaving right after she graduates)? I don’t know what kind of weather we would hit in April and I’m guessing June would be hot and far more crowded. Thanks!