I’ll second some of these suggestions in the Greal Lakes area. All of these schools also offer merit for the A-/B+ crowd.
Kalamazoo-small city with good ties to college, quirky kids, no greek orgs, wide open curriculum, lots of academic support structures in place (organized study groups, peer tutoring), senior project opportunities for kids that might like a faculty supported deep dive
Beloit–small city, students are smart, welcoming, and diverse. Very little and atypical greek life, emphasis on faculty mentoring
Knox-- friendly, collaborative students, nice campus, small town but trains to Chicago. Big emphasis on balance for students and helping connect with experiences for personal and academic growth.
Lawrence-- compact campus adjacent to downtown area, supportive admin and student body, optional summer start program to provide a longer, gentler transition to college life, some greek orgs but not a large factor on campus, music draws in a lot of students
Wooster- students a little more mainstream, great campus with nice facilities, very welcoming, a strong student support center (well staffed, opportunities to get help with a variety of study and life management needs–like executive function support), all students complete a senior thesis, small but nice, walkable downtown.
Touring Lawrence we met a sibling attending St. John’s. They had excellent things to say about their experience with campus, peers, and academic rigor but the curriculum is both very unique and rigid.