How do I know what should I do to feel happy

I have a job and enough salary to go for tour in European countries (as I have resident permit which can be used to go and stay Shenzhen country for 3months!!). The flight tickets are so cheap 100Euro for to and fro. But I am unable to decide if I should go and visit places.. I don't know if I will enjoy that or not. I am unable to decide what to do in the weekends.. buy water color and start painting? I think of that often but never tried.. I always thought will that make me feel happy? I can't decide what to do beyond my working days.. Its really annoying and boring.
I am worried, that I am not enjoying my life to the fullest and at the same time unable to decide what to do to enjoy my life, how to know which activity will give me the feeling of joy and completeness and that I did enjoy my stay at Holland.