Entry is free and single rides can be bought individually. The One-Day Pass does not skip queues; Priority Tickets and Priority Admission are two more products.
No single north-shore viewpoint. Oishi Park is the open flower view, Enkei Hall the cherry stretch, and the Momiji Corridor is autumn - not the Momiji Tunnel.
A day trip works, but the first direct Fuji Excursion reaches Shimoyoshida at 9:13. The park is open 24 hours, so only an overnight stay buys you sunrise.