I'm not sure that this text is correctly written. Help please.

We left for a bike ride far outside the city to take the picture. We were little lost,  dogs chased us and we found new trails. The skin on our backs burned in the sun and we were very tired, but still it was an unforgettable adventure.

How I would write it as a native english speaker...

We went for a bike ride far outside the city to take the picture.  On the way, we got lost, were chased by dogs and discovered new trails.  The skin on our backs burned from the sun.  We were tired at the end but it was still an unforgettable adventure for us.

the host is just adding emphasis to the word 'you'....maybe to make it easier to understand or grab the person's attention. The actual meaning of the word 'you' remains the same.

Open the windows

Today was a sunny day. Quite comfortable in the morning and not too hot.

We had a  heat wave that lasted two weeks and before that was the rainy season.

I didn't open the windows of my house enough in the past month.
Today, I finally opened the windows and let fresh air flow into my house.

I hope someone will understand my sentences and what I am trying to say.
Could you please check my writing? Thank you.

you are free to correct

We were having such a nice lunch today. well if by the lunch you mean "drinking beer with french fries". Drinking beer at 13 p.m. is a little bit weird, if you ask me, but still, somehow we ended up having a few drinks after the discussion club.  Often, I don't understand how one can drink alcohol in the afternoon and not have the rest of one's day   completely ruined.   Anyway, i'm looking forward to working a bit in the evening so i am hoping  not to have a middle-day hangover, cause even a few bottles of beer ruin  my ability to think properly.