While Allie was busy finishing nursing school, Mark was planning a super secret vacation to Mackinac Island as a "graduation vacation". Mark was so excited about this that he told everyone that he could, and they all kept this a secret as well (Allie is still very impressed). After the chaos of graduation/NCLEX they were on their way to Mackinac Island via ferry boat. Being the perfect guy that he is, Mark planned the trip during the island's Lilac Festival (Allie's favorite flower). After a bout of seasickness/car sickness and some Dramamine, Allie was exhausted when they arrived. Mark tricked Allie into going to "get some coffee" and executed his very romantic proposal in front of a gazebo in the Inn's private garden. Allie was thrilled and equally shocked, their happily ever after had just begun!