Do we have time to visit the wall and catch a cruise ship?

We arrive late on 6th October, with 1 night Beijing Capital airport hotel reservation, checking out on 7th October when we have to catch a cruiseship departing from Tianjin port. Can you recommend the best way to visit the Mutianyu Great Wall, departing from the hotel as early as possible and to be able to get to the port by 1530-1600hrs latest to board the ship. It departs at 1800hrs but consideration about leaving or taking our luggage with us on the tour needs to be taken. Would we have time to safely do this and suggestions about the best way