Possible Clues:

• Mountain, extremely testing - summit unattainable
• The very height of the holiday for the First Lady
• Hi, there! By the sound of it; it's enough to give her a holiday
• She might reach the height of holiday there
• That's what always is in Latin with nothing over
• A high spot for the first mate and others
• Conquest of 5/29/53
• Tee revs up the mountain
• Ultimate challenge
• Goddess Mother of the World