Here are a couple of suggestions. I don’t know much about these particular schools, but they seem promising. Most of the info here is coming from here though I used College Board’s website for the classification of suburban/rural/urban and residential/commuter campus.
Eastern Connecticut State: No classes with more than 50 students, 14:1 student/faculty ratio (a ratio which can be gamed, but when combined with the class size info, it’s promising, especially for a public school), it’s a residential campus, and has an undergrad enrollment of about 4500 students. It’s classified as a suburban campus. And the OOS tuition price seems very reasonable.
Endicott (MA): No classes with more than 50 students and 68% have less than 20. There’s a 13:1 student/faculty ratio and it’s a suburban residential campus just off the water, seems likely to have other nature exploration possibilities, and is 45m from Boston. There are about 3200 undergrads here.
Fitchburg State (MA): No classes with more than 50 students and 55% have less than 20, along with a 14:1 student/faculty ratio. Seems as though there are nature explorations possible, and it’s about 1h15m from Boston for day trips. 3800 undergrads.
Manhattan College (NY): 3300 undergrads, no classes with more than 50 students, and 55% have less than 20. There’s a 12:1 student/faculty ratio and it’s a residential campus. It’s in Riverdale rather than in Manhattan, but it’s considered an urban campus and there are obvious TONS of off-campus activities available. Just realized this one was Roman Catholic, though.
Marist (NY): 5600 undergrads with no classes with more than 50 students. There’s a 16:1 student/faculty ratio and this suburban residential campus is one of the closest ones (on this list) to the NYC metro area.
Norwich (VT): This is classified as a rural campus, but it’s less than 20m to Montpelier and a weekend trip (or LONG day trip) is very doable to Montreal. But there are lots of opportunities for nature exploration here. 3200 undergrads at this residential school with only 1% of classes having 50+ students. There’s a 13:1 student/faculty ratio.
Quinnipiac (CT): 6800 undergrads here, and 2% of classes have 50+ students. There’s a 15:1 student/faculty ratio at this residential campus that’s classified as suburban. Doesn’t seem like a nature or urban mecca, but I definitely think there are off-campus opportunities available.
Ramapo (NJ): 5400 undergrads here and no classes with 50+ students. There’s a 16:1 student/faculty ratio at this residential, suburban campus that is about 1h15m from NYC and also seems as though there might be some nature opportunities as well.
Rowan (NJ): There are about 16k undergrads at this residential campus and no classes with 50+ students. There’s a 17:1 student/faculty ratio, and it’s about 40m from Philadelphia or 2h from NYC.
Salisbury (MD): There are about 7100 undergrads at this residential campuses with 2% of classes with 50+ students. It’s classified as urban, but we’re talking the urban part of Maryland’s eastern shore. If you’re visiting St. Mary’s of Maryland, I’d definitely make a stop here, too.
SUNY New Paltz: There are about 6600 undergrads at this suburban, residential campus. 3% of classes have 50+ students. If you’re a NY resident, it’s always good to have some in-state options, and I’ve heard good things about this campus.
Suffolk (MA): It’s classified as a commuter campus, but 75% of first-year students live on campus. And this school’s in Boston, so tons of off-campus opportunities. There’s a 14:1 student/faculty ratio and 1% of classes have more than 50 students. There are about 4400 undergrads here.
The College of New Jersey: No classes with more than 50 students, a 13:1 student/faculty ratio, and about 7100 undergrads here. This suburban residential campus is about 1h30m to NYC and less than 15m from New Jersey’s state capital of Trenton.
Towson (MD): This is classified as a residential school, and it has one of the lowest percentages of classes with 50+ students that I’ve seen at a big school (3% of classes with 50+ students, and there are about 18k undergrads here). But that still probably means that most of the intro classes are going to be big, because 3% of a lot of course offerings might still be most of your intro classes. I’m not sure what the honors college requirements are here, but it might be worth investigating.
Wagner: This is a much smaller school (1600 undergrads), but it should be a pretty easy visit based on where you live. This residential, suburban college is in easy distance of NYC with 2% of its classes with 50+ students but 67% of its classes with fewer than 20 students. Thought it was at least worth mentioning.
Washington College (MD): Again, if St. Mary’s is in the mix, I’m throwing out another small school in a rural area. But Chestertown is also near the water but closer to major metropolitan areas (1h to Wilmington, DE, 1h30m to Baltimore, 1h40m to Philadelphia, and 1h45m to Washington, D.C. There are no classes with 50+ students, 79% of classes have fewer than 20 students, and there’s a 9:1 student/faculty ratio.