When I just had my son, I would take a large umbrella (just carry it like a sling), a large beach blanket, a diaper backpack with snacks and essentials in it . He was much more interested in just playing with the sand than any sand toys at that age.
When I had my daughter, I would put her in the Bob stroller, and pile everything into the stroller. A small cooler for food and drinks, a couple of sand toys, the umbrella, a beach chair, and a large blanket.
I never bothered with one of those infant tents. My kids preferred to be right in the sand.
I also recommend a long sleeve rash guard top and a hat if your child will wear one. Neither of mine would tolerate a hat. So every 20 minutes I would pull them back under the umbrella for 20-30 mins.
I would also suggest going to the beach with a friend who has a child the same age as yours. You get some Mommy conversation and the two kids will keep each other occupied. Also, if you have to go to the bathroom, you and the other Mom can trade watching the kids and all your stuff.