For the beach you will be covered rod wise, and I've fished the beaches there for years with Lamson LP 3.5s so your Ross will be MORE than adequate because most of what you hit off the beaches will be of the bull dog variety, pargo around the rocks, Jacks primarily, pompano, ladyfish, some small roosters if you can really move the heck out of your fly. A big rooster off the beach will mostly be a matter of luck, but it does happen. Intermediates and fast sinking will cover everything, unless you like throwing poppers then you'll want a floater. Fish there aren't quite the followers stripers are, but you still generally need more strips on a surface bug than an intermediate will give you. basically stick to the sinkers for most work, switch to the intermediate over shallow rocks. I've also gone entire trips with just intermediate both off the beach AND bluewater.
Fly selection off the beach is simple as you want to make it. brown and white, chartreuse and white, and olive and white flashtail clousers in 6, 4, and 2 will keep you going the whole time, but there are times when "clear" flies matter. Doesn't have to be surf candies or jiggys, can be ultra hair clousers, but things in the "smoke" color, or very pale purple and such things can really be the ticket if your bushy clousers aren't drawing attention. There have been times when the only thing that draws the big jacks and Roosters are big Cotton Candies. A real bitch to cast, but the big switch rod and teeny type line will do you good. You'll know if you need to throw stuff like that if you see roosters or jacks cruising through the breakers with ladyfish in their mouths
So much more to add... Let me know if you want more. Also if you do go bluewater, I might consider "renting" you some flies. Basically send you my kit, and you send it back after the trip, only paying for what you lose or wear out.