The BMW museum is very easy to get to by the subway. You have to make one change traveling from the main station but it is to an adjacent platform. When I tried in May it was difficult to get a place on a plant tour. When I emailed them they replied to call back by phone the week before the visit. When I did that they said they didn’t have the schedule for tours for next week yet and check back in several days. When I did that they still didn’t have a schedule so call back next week. When I did that, there were no spaces left. I enjoyed the museum.
You can wander around the Olympic Park also, it is very close to BMW. I think they were just restarting tours after Covid so perhaps now they have it better worked out. There are two different places, the museum is on one side of the road, the showroom is on the other side. The showroom is free and it is huge. Don’t miss that.