We are contemplating an extended family vacation at a Timeshare resort in Snowbird in mid June next year. None of us have ever been to Utah. We have ages from 12 to 81 years. Is there enough to do in the Summer to entertain that variety of ages? Does the altitude cause altitude sickness problems typically? Is the weather warm in mid June, or would the altitude make it quite cold yet? Any tips or information would be greatly appreciated.