There's a tulip park in Hokkaido too!
There is a flower park in Yubetsu near Monbetsu in the eastern part of Hokkaido,
and from early to late May, you can see a wide area full of tulips.
https://maps.app.goo.gl/Sth6dhuuTXQXBidW8?g_st=ac
Parking is free, and if the flowers are in full bloom and gorgeous, admission is charged, otherwise it is free (May 28th, when about 1/3 of the flowers have withered, admission is free). If you come to the eastern part of Hokkaido in mid-May, there are two Shibazakura flower lawn parks, so after the cherry blossoms, go to Toto in Hokkaido~