Fruits

My fauvourites (favourite) fruits are the apple, the orange, the pear and the watermelon. The most popular fruit in Spain is the orange, because many people eat it thinking to this fruit is very delicious.

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Only one spelling mistake:  favourite

In your sentence, favourite is an adjective, not a noun.  The 's' is added to the noun ('fruit'), not to the adjective ('favourite').

"My favourite fruit is the apple."

"My favourite fruits are the apple and the orange."

The word 'to' is not usually added to the verb 'think'.

"I think fruits are good to eat."

"She was thinking about Spain."