Can I put up a canopy tent for shade? Or only umbrellas?

Yes you can

Umbrellas for sure, but I believe that canopies above a certain size are restricted. You would have to check with the city.

I know I have seen both

You can do both😊

Yes

I saw both when I was there and the lifeguard didnt say anything to the people.

Both...i saw canopies and umbrellas..

I think you can