Suggestions for bike trip base in Midwest

[Alan]

I plan an annual 5-7 day trip for a group of cyclists. We usually stay in resorty type towns with other things to do besides cycling and with restaurants and do daily rides of 40-60 miles together. We live in Cincinnati and have been to places including Traverse City MI, Grand Haven MI, Door Co WI, Elkhart Lake WI and Madison WI. I am looking at places for next June.

This group prefers relatively flat terrain but will do some hills but not super hilly areas.

Any thoughts on a base location for next year? Was looking at areas in western PA or NY state that are drivable for us. I have ridden in Niagara region of Canada near Niagara Falls which is decent also.

Let me know your thoughts. Much appreciated.

Alan