It is still winter in March at Hokkaido although Google says it’s spring. You can still enjoy snow activities and the weather is better with lesser snow falls and not as cold as February. But make sure to go before the school holiday season so it won’t be pack with people.
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See below on my 4 days hokkaido itinerary.
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Day 1 – Mt Moiwa and check in at Asari Classe Resort
Day 2 – Asari Ski, Ishiya chocolate factory and Otaru Canal and tried fresh hokkaido King crab from the market
Day 3 – Lake Toya, Shōwa-shinzan, noboribetsu marine Park nixe, noboribetsu jigokudani and Asahikawa Ramen Village
Day 4 – Biei furano, Alpaca farm, ice cream making at furano cheese factory(not included),
Tanukikoji, nhk tower at sapporo and dinner kobe beef

AloJapan.com