Antique Photos From an Auction – Recognize anyone/thing?

I bought a lot of old photos in a basket at the auction, and I’ve scanned most of them.  They are below in this post.  A few have names /etc. on them and I’ll post those as well…some have things on the back hard to read… any help, appreciated.  My hope is a: to find the families who might be working on family trees… the second is to figure out some of the places and people and things… of particular interest is the boardwalk scene (where?) the man with guitar and banjo … and the tennis player… the back of the tennis shot says Forest Hills – 1921 and then the names Tilden & Shmidgne (the second I’m not sure of).  I love stuff like this.  I’m nearly certain this must be a photo of William Tilden – a famous US Tennis player.