One of the best treks that you can really enjoy with freinds. Very easily accessible from both mumbai and pune. Take a bus to Lonavla and from lonavla railway station take a train towards Pune. The very next statio is Malavli. Get down there and the trek starts.
Do carry some water with you as the water is not available and in case it is available it is double the price and most imp only local brands are available. Aalos remember to carry something to eat. It’s a great picnic spot and you can take bread, jam, chips, snacks etc..
The trek is pretty long and bit tough. If you were to go rite till the end it will take you around 3 hrs one way. so by that standards it will take a lot of time..but the way to the fort is very good with beautiful surroundings and the clouds palying with you..The climbing of the fort is a bit tough with a lot of stairs, but once you rech the top its altogether a different world. From the top you can have the entire view of the city and a perfect place to get yourself clicked.
Overall an amazing place to enjoy. There are 2 forts there. One is the Lohgadh fort and the other one is Vistapur fort. You can choose to go to both these but it will be very hectic. Ideally one fort should be visited so that one you are there, you can spend some time at the top of the mountain.