Visited Guhagar in the month of August. No other period can be at its best than monsoon to visit Konkan. At around 310 kms from Guhagar, it wont be an ideal location for a weekend outing but 3 to 4 days can be sufficient to explore the magics of Guhagar.
Account for minimum of 7 hours journey including short breaks to reach Guhagar from Mumbai. The journey becomes more scenic once you cross Kashedi ghat. The trench of 41 kms from Chiplun to Guhagar is wonderful driving experience.
We had earlier planned to stay in Modi Villa in Guhagar but dropped it and instead preferred a home stay, Shree Pooja , right in front of the beach. There are single bedroom cottages, not great rooms but location was perfect. There is no restaurant attached to it but caretaker prepares food on order if order is placed well in advance.
As Guhagar is a bit far from Mumbai, there are no weekend crowds to disturb the nature and silence. The beach is a long stretch of white sand with absolute no interuption of garbag/rocks. In my opinion this is the cleanest beach near to Mumbai towards South. Guhagar is as such a small but very beautiful town (another reason for it being quite). There are couple of good veg restaurants on the road near to beach which serve a very delicious snacks/breakfast. Annapurna restaurant on the same road is worth visiting for the seafood lovers.
There are couple of places you can visit from Guhagar.
Velneshwar is another beach, around 18kms from Guhagar, on the same road which can be visited enroute. MTDC has a resort on this beach.