Penguin walk usually starts from end dec to mid mar every year when the snow settled.

It's one of the shows at Asahiyama Zoo. In the winter when it snowed, you might be able to see it.

Seems it will start Dec. 28. You can check their website, top page. But the schedule may change depending on the weather. From Dec. 30-Jan. 1 the zoo is closed for year end/new year holiday.

There are various types of bus tours. There are various destinations and travel times. Asahiyama Zoo open from 10:30 am to 3:30 pm (entry limit pm 3:00) in Dec. Caution : The open time varies depending on the season. The light up time at Blue Pond is 5:00 pm to 9:00 pm in Dec. Caution : The light up time varies depending on the season.

すでに皆さん書いているように、もぐもぐタイムのスケジュール表で確認するのが確実です。ただ、積雪期限定のイベントなのでいつから始まるかは何ともいえません。こまめに動物園のＨＰを確認するしかないと思います。

I looked at their website and their last year's newsletter and they say usually starting from mid December (when there is snow on the ground). They will announce the start of the penguin march event on their website. Once it starts, the event is held twice per day (11:00- and 14:30-). It was started as an exercise for the penguins.

In addition to the above, you can spend ages just watching the hippos (if they are active). Plenty of cover even for outdoor exhibits.

Don't know, sorry.