Trimbak is the host of the Brahmagiri mountains, where the holy Godavari river originates. There is a temple on top of the mountain, which takes a good hour (or two) to hike up to. Amazing views, and lots of Indians (young and old) from all over the country undertaking the steps up. We haven't seen any tourists during the entire hike.
Watch out for the monkeys though, they can be quite fierce.

BRAHMAGIRI HIKE: Watch out for monkeys! Avoid carrying anything in your hands (apart from a stout stick) avoid wearing bright colours or bags/rucksacks in bright colours. Take plenty of water mobile phone. Buy some snacks at the bottom just in case you need to throw food away from you to distract monkeys. Avoid hiking alone.