I wrote about this weekend.

It was 3-day-weekend this week, so my family and I decided to visit Kawaguchiko in Yamanashi prefecture.
On the first day of the weekend, we went to a park. We enjoyed watching the beautiful autumn leaves falling. 
When we were about to leave the park, my husband noticed that he had lost his keys. Fortunately, someone had found it and returned it to us.
On the second day, we went to the Fuji laser dome museum.
My husband and I had actually visited there once before we had our first child. Now, we have 4 children. Time flies!!
There was a big dome, which used to be placed on top of Mt. Fuji for 35 years.
We watched the a short documentary about how difficult and challenging it was to build such a big structure on top of Mt. Fuji.
It was really impressive (moving?) to the point where I almost cried.
After watching the movie, we had lunch at a draft beer restaurant. I got to try 3 different types of draft beer. I like pills. (?)
It was really refreshing. I want to visit there again.

The yellow bits were the bits I didn't quite understand, but it was very well written :) 

About this weekend.

It was a 3-days-weekend, so my family went to Kawaguchiko in Yamanashi prefecture.

On the first day of the weekend, we went to a park. We enjoyed watching beautiful leaves.
When we were about to leave the park, my husband  realized [found out] that he had lost his key. Fortunately, someone found and returned it.

On the second day, we went to the Fuji laser dome museum.
Actually, my husband and I have had visited it[this place] there earlier, before we had kids. a child. Now, we have 4 children/kids. Time flies!!

There was is a big dome, and which used to be was placed on top of the Mt. Fuji for 35 years ago.
We watched the a short documentary movie about how difficult and challenging it was to built such a big/huge ladder on Mt. Fuji.
It was really impressiveng, and I was almost cried.

After watching the movie/documentary, we had lunch at [a] draft beer restaurant. I tried 3 different flavors tastes. I liked the pills.

I was really refreshed/[it was really refreshing]. I want to visit there again.

Note: while describing a particular landmark, eg. The dig dome in your write-up. 

           Always use present tense to describe it even though you are describing the past. 

           If you say, "there was a big dome." It can mean, there was a dome but now its no more. So in order to avoid this, for describing key landmarks we use present tense. 

"There is a big dome, which was......"

"There is this Big dome, which was......"

"