Take the Purple route (free, Charm City Circulator) to the Light St stop (Inner Harbor). Take a walk to see the cool, old, ships. Ride the water taxi across to Locust Point - kids love the water taxi. Walk to LP Steamers (half a mile) for crabs, coddies, and steamed shrimp. Jump on the Banner route (again, free) and take that back downtown (Pratt St stop - you can get off at Otterbein but I’d recommend a visitor just go back to Pratt. Either way, just follow the crowd and you’ll be ok).