There is no shortage of things to do in Tel Aviv, but one of the most unforgettable activities is to take some down time on the beach, which runs along the entire western side of the city along the gorgeous Mediterranean. Grab a bottle of wine and your best girl and have a sit on one of the southern beaches during a radiant sunset over the water; with the old port city of Jaffa to your left and the towering skyscrapers of new hotels and city life to your right.
Actually, there are a number of beaches with nice views to explore for the day, and they are all free, except for Hof Hatzuk beach, which comes with far nicer beach facilities than the rest of the public beaches. One of the beaches to look out for is the heavily orthodox section of the coast referred to as Separated Beach, which has segregated usage, some days for men only, and others for women. On Saturdays, however, the beach opens up to everyone as the orthodox religion prohibits its followers to go to the beach.
If you are looking for something a little more manageable, just to the right of that is the recently refurbished Metzitzim Beach, with new facilities including very nice places to get a cocktail, as well as a playground for the little ones. Then of course, there is the Hilton Beach, where you can get your hands on surfboards, kayaks and the like.
Each of the beaches is located in different areas, but Tel Aviv is a very walkable, so that would be the best way to get around. If you like, however, there are a number of cheap and able buses and metered taxis that can get you to whichever beach you like.