From the ramp, stay straight on East McComas Street.
The South Locust Point Cruise Terminal's entrance is on the right.
Your best bet is to take an UBER or a Taxi, unless you are renting a car. Depending on time of day and traffic, driving is ~ 18-20 minutes vs. 69-90 minutes riding light rail/bus. Plus you have to tote your bags. Per Royal Caribbean's website the pier address is: 2001 E. McComas St, Baltimore, MD 21230