秋は何をするにもいい（ベストな）季節だって英語でなんて言うの？

Expressing that a certain season is great for doing a variety of activities, you can say something like, "Autumn is the best time of year to do things" or "You can do everything in Autumn." If you talk about "doing things" it is a vey general term which covers a large variety, so it will explain that you can do almost anything at that time of year. Or you can simply say you can do "anything" or "everything" in Autumn, and it is implied that you cannot do everything in another season.

Sometimes native English speakers use autumn, but usually many will refer to the season as fall. Saying that fall is the best season to do outdoor activities implies that because the weather is neither too cold nor too hot, it is comfortable to do things outside during this season. Fall is the best season to do anything means that for any activity you choose to do, fall is the best season. Fall is the best season to do everything, is much more dramatic. The person stating this, believes that fall is the best season for every activity a person could choose to do.

As well as calling Autumn a season you can also call it 'a time of the year' to do anything means you can do lots of things or do most things So you could say 'Autumn is a good season to do/do just about anything' you could also say 'Autumn is the best time of year to do/do just about anything

The two sentences you see provided above are great ways to express to your listener that you can do almost anything during the fall season. In the first sentence you will notice the term pretty much and in the second sentence you will notice the term just about. Both of these terms mean nearly or almost. They would make an awesome addition to your vocabulary.

Native speakers will say like this: “ You're free to do whatever you want in autumn”. There are lots of other ways to say it, but this one is the most accurate and most commonly used. Here is an example on how to use this in a conversation: A: Which is your favorite season? B: Autumn, for sure! You're free to do whatever you want then.

Remember that native speakers typically use 'fall' as the name of the season, but you may still hear some people say 'autumn'. Either will be fine, but 'autumn' sounds more old-fashioned or very formal. 1) "Fall is the best season for almost every kind of activity." - This expresses that a person can do nearly anything they want during this time of year. 2) "You can do almost anything you'd like during fall." - This states that the person can do many things (but not all) during this season.