All of the Tel Aviv west side is one long beach which is divided into beaches named  according to the hotel or street nearby. Here is the list of the beaches from North to South.

Hof Hatzuk - is the only beach that is not free but requires an entrance fee - accordingly it has very good facilities. It is in a north part of Tel Aviv and you cannot reach it by foot from the center.

Sheraton or Metzitzim beach -  is called so because many years ago Sheraton Hotel used to be there - now this beach is called more often Metzitzim because of the legendary movie with Arik Einstein and Uri Zohar and also because Sheraton Hotel is now more to the South near Gordon Street - it is a bit confusing :-) The showers and the toilets have been recently refurbished so they are quite nice.  There is also a beach bar called Metzitizim open in the evening too and a new children playground.

The Separated Beach  on the left  side of Metzitzim (if you face the sea) is located the separated beach which is designated for the use of the orthodox religious people and there are days for men only and days for women only - However on Saturday it is a nice beach opened to everybody as the religious people are not allowed to go to the beach anyway on Saturdays. Also if you like to get a topless suntan you can go there in the women only days - they don' t mind at least they didn't last time I tried (a few years ago)

Atzmout Beach - between the separated beach and Hilton beach right under the Atzmout Park on the hill there is a narrow strip that is kind of gay and dogs beach   :-) no offense - dogs are allowed as it is not an organised beach and gays just chose to meet there ...

Hilton beach - The best beach if you like to swim in wave less sea - on the left part of the breakwater there is a pool like sea where you can enjoy swimming - just beware of the kayaks, boats and surfboards that are heading to sea from there.  There is a beach bar - restaurant called Topsy Bar 

Gordon Swimming Pool - newly renovated in a minimalist modern style on a wooden deck and with open view to
the sea and the Marina. Still the same cold salty water coming the depth of the sea. Opening hours Sunday to Thursday from 6 AM to 7 PM, Friday from 6 AM to 6 PM Saturday from 8 AM to 6 PM

Gordon Beach - Nice and clean beach many tourists  - the restaurant is pricey and not recommended - 1 shekel fee for the toilets that are reasonable clean - there is a Ben & Jerry Ice cream stand where you can have a nice efreshment. The beach bar decorated in Orange and white is nice if you like to watch the sunset with a cocktail in your hand:
Lalaland café, bar right there on the beach nice for sunset drinks and morning snacks.

Gym on the beach Gordon Beach

Frishman beach - Near Dan Hotel and the US Embassy is also a very beautiful and clean beach with nice beach beds. It is lovely to spend the morning there and than cross the Yarkon street for lunch or breakfast at Café Mezada. I just did this lately on a Friday morning and I felt like a tourist :-)

The southern beaches - all the way south until Jaffa there are mostly the same - I would like to mention Banana Beach Bar that is a bit souther from the Opera Tower and is a nice place to sit on the beach and have a drink  in a sloppy atmosphere.
 
Drums beach - on the back of the Dolfinarium complex that BTW is a place where you don't want to be - very
neglected and poorly looking - a beach and a pub where every Friday there are drummers sessions at sunset.  - you can also sit at Chinky Beach Bar next to it for drinks.

On the ruins of what used to be the Dolfinarium there are 2 new beach bars one is called Loca and has a nice view to the sea and the other one is Clara on the other side I have not been there yet but I heard it is a trendy beach bar.