My friend and I wasere determined to go hiking since both of us have been bored and monotonous?? for a long time.

It is not quite right to say that people are monotonous. One option is to use a different subject, like "Our lives have been boring and monotonous for a long time."

We rarely interact ed with our friends and tried not to go outside for unnecessary reasons on account of the horrible pandemic.

Since the hiking trail is not difficult, I just brought water, some tissue papers, my bag and the most important oneitem, which was thea mask.

Alternately: "... my bag, and the most important item: my mask."

We gathered in Yuen Long center at 11:30 and took a bus to the start of the hiking trail.

Once I stepped in the hiking area, I immediately felt that the air jad becaome fresher even though I was wearing a mask, and the sun shined on my body through the trees whichthat stand on the sides.

However, the good times could not last forever.

Our start time was close to midday, which is the hottest time.

fFortunately, my friend had brought a umbrella and mini fan which were really helpful for that situation.

By the time we would climbed to the top of the hill, which also known as Reservoir Islands Viewpoint, we were covered in sweat.

I thought it was worth spending the time and effort on hiking since when I looked at Thousand Island from the peak, it was very impressive and gorgeous.

My friend and I wasere determined to go hiking since both of us have been bored and monotonous for a long timelately.

I have taken out the part about being monotonous as that's not something that English speakers typically say.

We rarely interact ed with our friends and tried our best not to go outside for unnecessary reasons on account ofdue to the horrible pandemic.

Since the hiking trail is not difficult,. I just brought water, some tissue papers, my bag and the most important one which was thely, my mask.

We gathered in Yuen Long center at 11:30 and took the bus to the start of the hiking trail.

You can say "took the bus" or "took a bus", both are correct.

Once I step inarted the hiking areae, I immediately felt that the air became fresher (even though I was wearing mask) and the sun shined on my bodye through the trees whichthat stand on the sides.

At the beginning, I was very amazed by the nature.

It is not incorrect to say "very amazed" however it doesn't flow well.

However, the good times could not lastn't go on forever.

After walking for half an hour, I experiencedcould feel the power of the sun.

Our start time was close to midday, which is the hottest time.

By the midday, we were really feeling the heat.

And the more disturbing thing was thatTo make it worse we were wearing masks as we were walking.

Generally speaking, try to avoid starting sentences with the words "and"

It did not take a long time thatand I sweated a lot.

fortunately, my friend had brought a umbrella and mini fan which wereas really helpful forin that situation.

Whilst we walked and, we talked about some recent news and fads to kill the time.

By the time we woulhad climbed to the top of the hill which also known as Reservoir Islands Viewpoint, we were covered in sweat.

I thought it was a worth spendingwhile use of my time and effort on hiking, since when I looked at Thousand Island from the peak, it was very impressive and gorgeous.