A museum of optical illusions, including fun 3D ones like the Ames room that you can walk into.
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Meeting at the Tel Aviv Port, you can ride a Segway through the Yarkon park or along the Tel Aviv beach. No experience necessary. Must reserve in advance.
Namal Tel Aviv, HaNamal
Once a commercial seaport, the Port of Tel Aviv was abandoned and later reimagined as a popular attraction and shopping district. The port is one of the most dynamic areas in Tel Aviv, including a multitude of shops, restaurants and nightclubs. During the day, this is a beautiful seaside boardwalk, great for restaurants and people-watching. At night, the bars and nightclubs open up.
Sheraton beach
Just south of Tel Aviv Port (which has no beach, the waves crash against the wall of the boardwalk). This beach became famous as the setting of the movie Metzitzim (1972). Now it's the most popular destination for families.
Nordau beach, the religious beach
This beach is male-only on Sunday/Tuesday/Thursday and female-only on Monday/Wednesday/Friday. On Saturdays it's open to everyone. It attracts many religious people who don't want to be seen by the opposite sex in bathing attire. It's surrounded by a wall to prevent people outside from looking.
A narrow strip of beach, south of the separate beach, where dogs are permitted.
The largest public park in Tel Aviv. The Yarqon River runs through the park, and spills into the Mediterranean Sea. Most of the park lies north of the river, but the south bank has a nice portion of it as well. The park is an excellent place for physical activities of all kinds - walking, jogging, cycling, boating, kissing, etc. You can also come and join a game of football/basketball at almost any time. The park is clean (but the river is not - do not swim!) and except for a few small parts is very well lit at night.