There's two options I would love in Maps.

1) "I already know this part" where the navigator is muted for part of the journey and you can just get directions for the parts you don't know. I feel like this is a very common occurrence for people but we just leave the navigation on and it consumes the battery (increasing carbon footprint) and distracts us (increasing danger)

2) Multi-method transit. It's a nice day out. I don't want to drive directly to my destination. Show me free parking and let me walk half a mile to finish. This would also encourage more people to walk and be a far greener option.