There is Krishna Menon Museum - dedicated to late V K Krishna Menon, the former Foreign minister and Defence minister of India and Pazhassiraja Museum - with copies of ancient mural paintings, antique bronzes, coins, temple models and megalithic monuments.Though these are not really famous or large musuems,you can visit them if time permits.More data like addresses and how to reach can be given on request.
But what Kozhikode really has to offer are its beaches.Also there is Kaapad Beach where Vasco Da Gama first landed in India