You could try Indroda's Nature Park or Nature's park in Baroda as well if you are fine with travelling. There's place called POLO as well, we had gone there during college years.Jhanjri would not be apt place since it's risky during and immediately after monsoon. other options include sapteshwar and utkanteshwar,though am not sure how safe and feasible it will be for you .You could try places which are near to Baroda and there are too many one day picnic options available there. should you seek more detailed information please drop me a message.
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