As mentioned already, Cocoa Beach is good. I found that the south side of the pier was better than the north side, but do both, as well as beneath. Finds included gold and silver rings, a silver figaro chain bracelet, a cool necklace with lion head pendant, watches, foreign coins, misc. other jewelry and lots of clad. If you don't mind the walk, I used to detect from the pier to Jetty Park to the north or from the pier to Lori Wilson Park to the south. Don't forget the volley ball courts on the south side of the pier and keep an eye out for events taking place on the beach as well, including concerts and surfing competitions.
I don't know how much beach detecting you have done but you will not be the only one hunting those beaches so you will want to either get there at the break of day or stay until the crowds thin out. Observe where people are sitting and hit those areas. Hunt up to the walk ons, also. I have even hunted along the edge of the dune line (but stay off the dunes per state law) as some people like to sit up away from the crowds as well as some moonlight romantics take place (moonlight not required). Even walking the middle of the beach has resulted in finds albeit, they are usually few and far between. I even purchased a headlamp for detecting after sundown (just stay alert for drunks, homeless and people getting romantic).
It is not uncommon for people to toss coins (usually pennies) off the pier when you are detecting just to see if you find them. You will also encounter the occassional heckler but just smile and keep going.
Although I never hunted it, I have heard New Smyrna Beach can be good hunting as well. I can't think of anything else to add so good luck and HH.