Nashik is full of Temples, Ghats & Forts...
1. If you are found of trekking i should say Must visit Harihar fort & many others like Anjenari, Anchala, etc.
2. Nashik also have bunch of Temples with great architectural significance like Vani temple, Trimbakeshwar temple, etc
3. If u are travelling from pune ... prefer naneghat & malshej ghat route
There's a lot of scenic places near Nashik as it is close to Sahyadri Range. one of them is Bhandardhara Lake camping which you can have a look at my profile. There's a lot of camps managed by the local people over there. You can simply google it and find the details. Other than this, you've many options to trek like Ratangad, Harishchandragad and Highest peak in sahyadri range Mt. Kalsubai.
Hope this helps for you to plan a getaway! Thank you. Have a great day.