Susan said that she needed info on what ferry she could take from Alicante to Valencia. The question is well taken since many people visit or fly into Valencia and than plan to travel further south to Alicante.
Unfortunately, to my knowledge, there aren’t any direct ferries going along the coast from Valencia to Alicante. There are only the ones going to the Baleares Islands ( Mallorca / Ibiza ) from Denia or a nice one ( even though it’s short) from Alicante and Torrevieja to Tabarca Island.
There is a wide choice of transports that can either take you from one coastal area to another along the coast or inland. Making tourist stops is a fun way to the see the country, so scout around my accumulation of ideas and if you had been thinking about seeing the coast, you can take a cute train connecting Alicante with Benidorm up to Denia, enjoy its beaches and a good paella and then catch a regular train to Valencia from Alicante’s central train station. It all depends on the time you have.