Tours for Kushiro?

We will be visiting Kushiro on April 26. All tours from the cruise line are totally booked. Will local offer tours at the port? Recommendations? Cherry Blossoms? I have mobility issues.

I don't know how long you will be staying.
Washo Market is famous for its Katte-don.
Katte-don（勝手丼） is a bowl of rice topped with sashimi that you purchase yourself.
https://www.washioichiba.com/
https://www.japan-guide.com/e/e6793.html
Kushiro Marsh is also famous.
https://www.japan-guide.com/e/e6792.html
Other information
http://en.kushiro-lakeakan.com/
Kushiro's cherry blossoms are scheduled for mid-May.
Maybe it will be sooner, so check it out just before.
https://hanami.walkerplus.com/detail/ar0101e60114/data.html
https://hanami.walkerplus.com/detail/ar0101e25549/
Depending on how long you stay, you may even be able to visit the lakes of Akan Mashu National Park.
https://www.japan-guide.com/e/e6800.html

you have three options 1) sign up in case two slots open 2) ask when on cruise if they are aware of alternatives 3) copy tour itinerary and get a taxi to take you to some of those places