Nagaon is a small town in the North Konkan region of Maharashtra, India. Just 70 miles away from Pune, it's a perfect weekend getaway!
One can take buses that connect Pune to Alibag. From Alibag, you can hire autos to reach Nagaon. The best way to reach Nagaon Beach from Mumbai is via the ferry from Gateway of India.
However, I would suggest driving to Nagaon as that gives you the liberty to explore a little on the go. Also, Mumbai-Pune expressway is visually beautiful, you wouldn't want to miss on that. The drive from Pune to Nagaon is a delight, especially during Monsoons. Make sure you are visiting around September-December. The beauty is at its pinnacle during this time, and the sun wouldn't hurt your sentiments.