Story, photos and video by Cassie Hepler Nestled on a sandy strip between the Sierra Madre Mountains and Banderas Bay in Mexico, Marriott Puerto Vallarta Resort & Spa offers a combination of zen, nature and fun in the sun. We had been discussing this visit for months, finally making it a reality seemed so surreal and I was psyched. I ended up talking to a former teacher turned principal on the plane most of the flight down, discussing philosophy and the meaning of life. Pretty heavy travel talk, but I loved it! This mountain-meets-ocean resort is only 7 minutes from the Puerto Vallarta airport which is a relief in itself…