Det er i foråret, at jeg bedst kan lide at gå ture, fordi alt føles lettere.

This is a very common Danish emphasis structure, often called a cleft sentence.

• Det er i foråret, at ... = It is in spring that ...
• It highlights i foråret as the important part.

So:

• Jeg kan bedst lide at gå ture i foråret is more neutral.
• Det er i foråret, at jeg bedst kan lide at gå ture puts special focus on spring.

English does the same thing: It is in spring that I most like going for walks.

Yes, om foråret is also possible, but there is a small nuance.

• i foråret points to spring as the time period being singled out.
• om foråret often has a more general during spring / in springtime / every spring feel.

In this sentence, i foråret works well because the speaker is emphasizing which season they like best for walking.

So both can make sense, but i foråret fits the contrastive structure nicely.

Because Danish often uses the definite form of the seasons in time expressions.

Common patterns are:

• i foråret = in the spring
• om sommeren = in summer / during the summer
• om vinteren = in winter

The bare form forår is possible in other kinds of sentences, for example when talking about spring more generally as a concept:

• Forår er min yndlingsårstid = Spring is my favorite season

But after prepositions in expressions like this, foråret is very normal.

Bedst means best, and here it is used the way English uses best or most with preferences.

So:

• jeg kan lide = I like
• jeg kan bedst lide = I like best / I like most

In Danish, kan bedst lide is the normal way to say like best.

Examples:

• Jeg kan bedst lide kaffe = I like coffee best.
• Hvilken årstid kan du bedst lide? = Which season do you like best?

Because after at, you are in a subordinate clause, and Danish no longer follows the usual main-clause verb-second pattern in the same way.

In a main clause, you normally get:

• Jeg kan bedst lide at gå ture.

But in a subordinate clause, Danish often allows the adverbial element to come before the finite verb:

• at jeg bedst kan lide at gå ture

So the sentence is showing normal subordinate-clause word order.

A useful thing to remember is:

• main clause: finite verb is usually early, often second
• subordinate clause: the word order is more relaxed, and adverbs often appear before the finite verb

Even though it looks literal word-for-word like can like, kan lide is a fixed Danish expression meaning simply to like.

So:

• jeg kan lide det = I like it
• jeg kan ikke lide det = I don’t like it

You should learn kan lide as a unit, not translate it word by word.

Very often, Danish uses this expression where English just uses like.

Because they are doing two different jobs.

1. Det er i foråret, at jeg ...

   • Here at means that
   • It introduces the clause after the cleft structure

2. kan lide at gå ture

   • Here at is the infinitive marker to
   • It goes with gå

So:

• first at = that
• second at = to

This is completely normal in Danish.

Because gå ture is an idiomatic way to talk about going for walks in a general or repeated sense.

• at gå ture = to go for walks
• at gå en tur = to go for a walk

So the plural is used because the sentence is about a general activity, not one single walk.

Compare:

• Jeg kan lide at gå ture = I like going for walks.
• Jeg vil gå en tur nu = I want to go for a walk now.

Here føles means feels.

This -s form is not a normal passive in the English sense. In this sentence, it has a more middle meaning: how something feels by itself.

• Alt føles lettere = Everything feels lighter / easier

This is very common in Danish:

• Det føles godt = It feels good
• Det føles forkert = It feels wrong

So just learn føles here as the normal way to say feels.

Lettere is the comparative form of let.

• let = light / easy
• lettere = lighter / easier

In this sentence, the intended meaning is something like:

• everything feels easier
• or everything feels lighter

Danish let can cover both ideas depending on context, which is why lettere can also feel slightly broader than just one English word.

Because Danish, like English, can leave the comparison implicit if it is clear from context.

So:

• Alt føles lettere = Everything feels easier / lighter

The full comparison is understood as something like:

• than usual
• than in other seasons
• than before

If you want to say it explicitly, you can add end:

• Alt føles lettere end om vinteren = Everything feels easier than in winter.

So the sentence is perfectly natural without end because the comparison is already understood.