What is nice about the Marriott is there is a parking lot attached to the hotel. It is $3 for the day when your ticket is validated.
If you are driving, please use a mapping software to get there. I am not the best at directions. It is pretty simple to get there from the PA Turnpike or 76. It does get backed up getting there in the morning, so please allow yourself some extra time to get there.
You can take the train. The R6 Norristown line drops you off at the Conshohoken station, where you can walk to the hotel. Go to septa.org or isepta.org (designed by Jason Tremblay and developed by Chris Conley and Randy Schmidt of umlatte.)