February 2025: Sapporo > Tokyo

Hello!

I am planning to fly from London to Sapporo on 1st February to enjoy the Snow Festival. I then plan to travel down towards Tokyo by train, and fly back to London on 16th.

My plan is:
1-6th Sapporo (5 nights)
6-7th Hakodate (1 night)
7-9th Aomori with day trip to Hirosaki (2 nights)
9-11th Sendai with day trip to Matsushima Bay (2 nights)
11-16th Tokyo (5 nights)

Is this do-able? Should I purchase the JR East-South Hokkaido rail pass and activate it on the 6th?

Thank you