If I were going anywhere for reds, trout, and flounder, I would gear up with the following:
I think the Stella 4K is the best reel on the planet for what you are going to do, but then again, I am a spinning freak.
I would use 12 pound mono, or now that I have been using it offshore, maybe 20 pound braid. I would add a very small black ball bearing or good-quality crane swivel. To that, I would tie 12-18 inches of 20 pound fluorocarbon, and the lure to that. You don't really need the swivel except with jerkbaits or spoons and a lot of people would argue you don't even need them then, but I am lazy at tuning lures and with a spinner, I use the swivel.
1. Like somebody said: Gold spoons. If there is no weed (the kind that tangles--not the kind you smoke) I would go with the 1/2 and 3/4 ounce gold or copper Sprite. If there is weed, I would use the Nemire weedless with internal rattle--expensive, but so is the trip.
2. I cannot work jerkbaits effectively, although most of my buddies swear they are the cats meow for trout, especially on shell bottoms. I personally take shadtails in 3 colors-red/white, chartruese, and black or purple.
3. Topwaters. Nothing beats a blowup in shallow water. There are a bunch out there, but I personally use Top Dog Juniors and she-dogs.
4. Suspenders: Corkies or rumored to be the best and there are now a lot of imitators out there. They are slow-fished, tunable, skill-based lures, and I don't have the patience for them. So I use a hard-bodied Mirrolure, either 51MR or 52 MR.
Some people would also take crankbaits. If so I personally like the Rattle Trap.
Other than that, in my opinion, you don't need nothing.