Last week, I went by the sea with my family.

Typically we´d say "we went TO the sea". When you say "by" the beach it implies that you're near the beach almost as if you're just passing by.

We spent our days to strolling on the beach, to swimming in the waves, and to consumeing ice-cream.

When presently doing something or describing something you were doing in english you use the "ing" conjugation.

AtIn the evening, we admired the sunset which had beautiful colors.

That was a stay relaxing and unforgettable stay.

all the adjectives for a noun come first

We spent our days to stroll on the beach, to swim in the waves and to consumeeating ice-cream.

To make it sound more natural you could say: "May family spent our day strolling in the beach, swimming in the waves and eating ice-cream.

AtIn the evening, we admired the sunset which had beautiful colors.

That was a staye stay was relaxing and unforgettable.

Last week, I went byon the sbeach with my family.

We spent our days to strolling on the beach, to swimming in the waves and to consumeeating ice-cream.

Or you can say 'We strolled on the beach, swam through the waves and ate ice-cream'.

AtIn the evening, we admired the sunset which had beautiful colors.

That was a stay relaxing and unforgettable day.

Thank you for reading.

Last week, I went byto the sea with my family.

Saying "by" sounds like you're not visiting, only going *past* it. The word "to" signals that you're actually in the place.

Example: "Along the way, I went by an ice cream store" <-- this means that you went past the ice cream store and not *in* it
"Along the way, I want to an ice cream story" <--- this means that you actually went *in* to the ice cream store.

We spent our days to strolling on the beach, to swimming in the waves and to consumeeating ice-cream.

Replace "consume" with "eat" because consume sounds very formal - you wouldn't use it if you were talking to someone so changing it sounds more natural.

Replace "to stroll/swim" with "strolling" and "swimming". Most usages of "to" before a verb are: 1. In order to (example: "If you want to learn, you will go to the library every day"), 2. A particle used for marking the following verb as an infinitive (I'm not a professional teacher so I recommend studying this on your own).

At evening, we admired the sunset which had beautiful colors.

Because you were talking about "last week", you have to put the rest of your sentences in past tense.

ThaIt was a stay that was relaxing and unforgettable.

Use "that was" to modify the noun "stay".

unforgetable --> unforgettable (just a spelling mistake)

My Last Week’s Activities / My Activities from Last Week

Last week, I went byto the sea with my family.

If the body of water is a “sea” this is good (eg the Mediterranean Sea, etc.). If it’s an ocean, lake, or something else, I’d use one of those other words. In US English I seldom hear “sea” used.

We spent our days to strolling on the beach, to swimming in the waves and to consumeing / eating ice-cream.

Consuming is correct, but it feels “clinical.”

AtIn the evening, we admired the sunset which had beautiful colors.

That was a stay relaxing and unforgettable stay.

Thank you for reading. / !

My Last Week Activities of Last Week

or "Last Week's Activities"

Last week, I went byto the sea with my family.

We spent our days to strolling on the beach, to swimming in the waves and to consumeeating ice-cream.

At evening, we admired the sunset which hadand its beautiful colors.

That was a stay was relaxing and unforgettable.