I tried searching on Google for for some good places and couldn't really find anything....
Thats because there arent any. You have to head south to the Palm Beach area where there is some or the Florida keys which is the best spot. The Port is the only place near Titusville and its not recommended as its very dangerous. Some people do snorkel around the rocks at the port but some areas are restricted due to the submarine base there. Its dangerous because of currents and boats and tangled fishing lines. The main things to do on the water near Tville is stand up paddle board, kayak, inland you can take an airboat ride. The Indian River lagoon is not clear water, polluted and nothing to see.
There are no snorkeling places in Titusville. Head south.
What do you mean by port? What port?
Sorry, there are no snorkeling places in Titusville.