Having grown up in Chicago and learned to ski at Alpine Valley, I now live in cleveland and skied Boston Mills last night. This was just for a warm up for the trip to Breck this wed-monday in 2 days. Can't wait. BM/BW in Cleve now have plenty of man made, and with the weather pattern now in place will surely have plenty when you arrive. Slopes are similar to AV, but shorter and can be crowded. Be aware that everynight of the week, both places have ski schools, so there can be lots of people there. Although last night, with 12 buses in the parking lot, the "black" slope was uncrowded, because rank beginners can't ski above their lesson rating.
If you want to ski local, it is just OK for making turns. Go early no crowds, you will be able to do probably 50+ laps (no joke, slope so short) My personal record is 72 laps. Or go at 3:30 and stay until 9 pm. I think I saw signs that they will be having very late night skiing (like 10 pm - 3am) sessions when you are there. Look at web for info. Could fit your schedule.
Otherwise just go for a day to Peak n peak. Much better. HV still better but a really long day. Best for a one night stay over. Maybe drive there and get in late, ski all day, drive back.