Telling a story - Fuerteventura

0 is in the present. 1 sets the scene in the past. (your) 2 mixes past and present. 3 moves to the past. 4 stays in the past.

Personally, I would keep 0 and 1. Put (all) 2 in the past. Then 3 and 4 are ok, as they are still in the past.:

REVISED

0.I hope you’re well. I’m writing you because I want to tell you about my last holidays with my parents. 

1.We went to the Canary Islands in July. We were in a very comfortable apartment in Fuerteventura. I think this island is the most beautiful place that I have ever visited. 

2.The beaches had clear blue water with golden sand. It was like being in paradise. In addition this place was really relaxing and calm because there weren't many people there.

3.The food was very delicious; I liked potatoes with sauce and the fresh fish. The waiters were very kind, at the restaurants when we had eaten, because they were explaining about the traditional Canary food.

4.The only thing that we didn’t like, was the weather, specifically the wind. Every day it was sunny but also there was a lot of wind. If you love water sports it is probable that you will enjoy it here because it is a perfect place for practice.

The important thing is to keep everything from 0 onwards in past as in REVISED. Alternatively, you could keep 0 (=we know it is in the past), then use the present for 1,2,3,4 . For English readers, mixing past and present makes for a chaotic read.

Otherwise, very well written!