I´d like this in a very formal way. Thanks!

I am passionate about everything related to art and improving human relations in society.
I enjoy reading classic literature and books and articles concerning psychology and sociology. Other interests include watching classic cinema, theater, music and dance, hiking and cooking.
I like to feel useful by helping others in voluntary associations.

English: Level B1 and Spanish native/mother tongue.
Full driving licence.

I am guessing this is for a "motivation letter"?  If so, it might be useful to mention which voluntary associations you have worked with.

"Hiking" is always outdoors so the word outdoors is redundant.

I'm fond of everything concerning art and social relations.
My interests include reading classical literature, psychology and sociology handbooks, watching classical movies, listening to music, dancing, hiking and cooking.
I like making myself useful collaborating with charities.