Bhandardara Lake Camping is the best place to relax.. not so crowdy, just put on the tent by side of lake and start chilling..
Bring your music system with you.. play your favorite songs...
You can reach to Bhandardara from Mumbai by:
Train: CST/Dadar to Igatpuri station
from you can get a auto to reach Ghoti Village.
from Ghoti there are share sumo cars to Bhandardara.
or you can go by road...