There is a great deal of mackerel around right now. Large schools are moving into the rivers. I have been pulling some nice fish out of the flats using surface plugs and top water lures. Keep an eye to the sky at low tide for the osprey. They are much better fisherman then we will ever be.
Seals are also a good indication that there are stripers around.
Just keep your distance though. There are stripers feeding on large schools of mackerel so sight casting has proven to be a great method of searching for stripers. It's important to use heavier lures to get below the surfacing schoolies for the big cows. That is if you can handle not putting a popper on and hitting a striper with every cast. Look for flats where there are nice drop offs and some grass.