We will be staying at BWI in June. If we want to get to DHS early (assuming boarding groups are still at a premium) should we just walk over, which is about 20 minutes, or get a lyft? I'm assuming the boats won't be early enough.
Walking, definitely, unless someone in your group isn't mobile enough to do that. Second choice is the boat, although I'd take that only if it were right there at the dock when I got there. Rideshare's a distant third--only if absolutely necessary.
I'd walk, I read a post on reddit someone staying there and used lyft, and just barely made it as it took so much longer for them to finally pick them up.