Is there a place to keep my luggage(suitcase), like a coin locker?

Lockers are available at the Bus Drop-off Area(#30) for storing lunches and coolers. Large lockers require a $5 rental fee for a lock, as well as a driver’s license or photo I.D. as security. Locks are available at Gateway Pavilion. Smaller lockers, which require $1 in quarters to operate, also are available at the Bus Drop-off Area.

I don't think so, best bet is to reach out to them directly.