If there is a place in Mumbai most visited during weekends is Juhu beach at Vile Parle. Its a very Famous beach at Mumbai and also the best junk eating joint too. I have been visiting Juhu beach since i was a child. I last visited here with my friends on a Saturday night at Around 12am. At 12am too you will find this place filled with people.
The best thing to enjoy here having pav bhaji sitting towards the beach. At Juhu beach you will also find people early morning for jogging and exercising.
I love being at Juhu beach always....