You can get in by train Kokan Railway or by bus on Mumbai Goa Highway. Konkan Railways is one of the best railway tracks laid in India. It's a engineering masterpiece with very long tunnels and huge bridges. You will experience beautiful landscapes along the way.Its 6-7 hrs journey in train from Mumbai to Ratnagiri.Ratnagiri comes in midway if one is traveliing from Mumbai to Goa.Travelling by Bus ( A/c & Non A/c is also equally comfortable. Most of the Busses leave around late evening around 7PM and reach ratnagiri early morning at 6AM.But if one is going in a group with friends and that to during Monsoon Season, Taking a morning train and travelling trough Konkan Raiways is highly recommended.