Isla Ixtapa is a great place to spend the day. You can snorkle, hang on the beach and have the best fresh seafood right on the beach. The city of Ixtapa is worth driving through on the way to the ferries or back to Zihua but not worth staying. Unless of course your idea of a Mexican vacation is staying in an American hotel eating cheeseburgers in the air conditioning and never having to speak a word of Spanish. In that case I guess Ixtapa is your place.