It's already been covered the 4 tracks in MI, but I'll add my 2 pennies.
1) Gingerman Raceway - South Haven, MI. Spend a little extra time here, South Haven is a beautiful little beach town that you won't see if you only exit the highway and head inland to the track. Great restaurants, some breweries, beautiful beach, pier, etc. Plus Sherman's Ice Cream located near the highway is worth the stop. Some great sunsets:
On the track itself, SCCA has 5 "Track Night in America" events scheduled at Gingerman this summer: https://www.tracknightinamerica.com/locations/1981670-gingerman-raceway They do a great job of helping Novices get on track, provide paced laps to start, novice briefing, etc. (EDIT... didn't see your TNiA reply earlier, sorry for redundant info)
2) Grattan Raceway - Grattan, MI. There's a number of groups that run here that are very friendly to join for HPDE. 3Balls Racing (join their facebook page if you do facebook), and plenty of other clubs run here (Alfa Club, etc.) with plenty of room to spare for non brand specific entries. Don't let the others scare you off. Yes it has elevation and off camber, but it has reasonable run off, and is a riot to gain confidence on. You don't have to do this:
In addition, West Michigan SCCA and Furrin Group traditionally run a Labor Day autocross at Grattan. This is different than your typical autocross in that it basically uses the whole track, with a few slaloms and strategic gates used to keep the overall speed down a bit. It's still plenty fast, and gives you a feel for the course and it's elevation changes. This fills up fast, so watching for registration on Furrin Group or WMSCCA's Facebook pages (again if you're on FB).
3) Waterford Hills Raceway - Waterford, MI. I'm less familiar with this course, but have attended a few track days here and ridden along. Waterford is the oldest road racing course in Michigan, celebrating it's 60th anniversary this year. As such, it's a narrow track, fun lines, with elevation, and a tricky swamp corner. It was just repaved, so it'll be a new experience in 2019. I'm not sure if any widening was done.
4) M1 Concourse - Pontiac, MI. I've yet to go here so I don't have much to add. It's the newest facility, and more of a private event / "club" type facility, with private garages and such. Gripes I've heard is very little runoff with lots of barriers.