There are wonderful urban veg gardens in the Corktown neighborhood. PJ’s Lager House on Michigan Ave is a V cool Corktown bar/restaurant. My BF’s and our friends’ bands played there often. I also suggest driving, biking, and/or walking thru Corktown, and my neighborhood, Woodbridge, which is just N of Corktown. My hood’s borders are Rosa Parks/12th St, Grand River Ave,* and a little N of Warren Ave. Amazing Victorian/barely Edwardian architecture and friendly folk abound in both. Should you visit the area, be sure you see the former cop shop at the corner of Grand River and Rosa Parks/12th. It’s breathtaking.
Neither 'hood is far from the Detroit Institute of Arts and the Historical Museum. Woodward Ave in that area has some spectacular old buildings, too. The former Smiley Bros bldg was designed by the same architect as the aforementioned cop shop, and is equally amazing if smaller.
Don’t bother with Greektown. It’s lousy with tourists, parking’s absurd, and lately has unwillingly hosted too many street fights. Mexicantown on the Southwest side is way cooler, less expensive, and the food is phenomenal. I’ve been eating at Armando’s on Vernor since the early 70s, and they own the fabulous Mexicantown Bakery right across the side street. I can also heartily recco Los Galanes on Bagley. We’d meet a buncha friends there every month or two in the BC (before covid) days. It’s worth waiting for a table at either place, and Armando’s has a bar which provides a very comfortable wait. Both also have parking lots. Try to go on a weekday so it’s less busy. Your friends may well have their own favorite places there, but don’t be talked into going to Xochimilco’s. They’ve yet to recapture their former culinary glory, and it’s packed with ppl who don’t know any better. 
Belle Isle is a lovely park in the middle of the Detroit River. It was designed by the guy who created NYC’s Central Park. The Indian Village neighborhood on the East Side has a lot of big, interesting old houses. Lake Shore Drive in Grosse Pointe, on the Lower East Side, is a very scenic route. Lotsa big, mostly pretty, rich people’s houses on one side, and Lake St Clair on the other.
Should you be herbally inclined, there are some fab dispensaries around town. The Green Genie is great if a friend has a medical card. LIV is pretty good. You can’t inspect the herbs w/o some sort of Michigan ID, but accessories are accessible.
I’ll shut up now. No more hijacking, I promise.
*It was once a very long Native trail.