I visited wet n joy with my friends. Zero outside food is allowed here. Food and lockers are not included in the ticket price you have to pay extra for that. Ticket price for us was 1k we got a discount because of college id. There was a minimum 1hr waiting for each and every slide so we couldn't enjoy all the rides. We did enjoy in the wave pool tho. Overall a nice experience but we shouldn't have visited it in the summer season it was very crowded.
If you happen to visit Lonavala then Karla caves are nearby. It is easily approachable by road and then there are about 200 steps to be climbed. There is also a temple of Ekvira - Goddess - Avtar of Maa Durga. The caves come under ASI but only a portion of the caves is open to the public. they ask you to remove the shoes at the entrance but there is no place to sit or keep the shoes in an orderly way despite Rs.25/- as the entrance fees. Something authorities need to look into.
Koraigad is a very old fort (before 14th century). The trek here is easier as compared to other forts. Kids enjoy the trek as it has stairs as well as small trail to climb. There is only maggi and water available, its not commercial yet so carry your water and food.
Very nice place to visit specially in the month of October and November once rain is over. Green valley view with fresh cool air in the evening. Road was a little cloudy in the begging however road trip is exiting.