There are many beautiful lakes around Mumbai that one can ride to.
The first lake I visited on my bike was Vandri lake in April 2019 when Covid was unheard of.
It is at a distance of about eighty kilometres along the Western Express Highway between Virar and Manor. As soon as the highway ride starts getting boring, you get the turn off for the lake. After the turn off it is a beautiful ride of approximately five kilometres on a single lane road which am sure will be beautiful during and just after the monsoons.
Met a lot of other bikers there too.
Carry your breakfast with you, have it at the lake in beautiful surroundings and carry back your trash.
Here are a few pictures followed by a short video of the ride. Enjoy.