Last weekend.

I went travelling last weekend with my roommates. I went hiking, climbed mountains , and I rode the a horse for the first time . I felt so excited about such these experiences. I want to try more new things and have different feelings. What's more, doing more climbing is also a good way to relax. ourselves. Life seems to be more wonderful after having taking a trip. Today, I have lots of work to finish, so I'll stop here. Best wishes！ Of course , correct me and thank you.

Sounds like a great trip!

When you wrote "climbed mountains," did you mean 爬山? A better translation is "went hiking." In English "climb mountains" sounds more like 攀岩 (rock climbing).

Use "the" if: a) there is only one thing (the sun, the earth, the Internet), or b) you are mentioning something for a second time. (I have a cat. The cat's name is Tiger.) So "I rode the horse" is wrong because there are lots of horses in the world and you haven't talked about this horse before. "I rode A horse" is correct.

Use "I'll" for decisions you make spontaneously (right now). For example, "The phone is ringing. I'll answer it!"