If you’re comfortable enough with it, there are some great gravel “roads” around Belle Isle and below Buttermilk trail. You can also connect to the floodwall path then to ancarrows landing/poop loop. Poop loop is technically a mountain bike trail but it’s easy enough that anyone can ride almost any bike on it.

Once you get used to riding looser surfaces like gravel, it opens a ton of options to ride bikes away from cars in the city. Have fun!