The importance of SS/H at Mudd has been stressed since the founding of the school, and the department at Mudd is actually the largest department. So there is a fair amount of variety in the courses there - music, art, anthropology, sociology, literature, history, just looking at some of the professors in the faculty list. Of course, the H/SS courses at the 5Cs greatly increases the possibilities for students.
The H/SS requirements at Mudd include a depth requirement (4 courses beyond introductory in a specific area) and a breadth requirement (courses in different areas). Five of the courses must be taken at Mudd, though that can be decreased by one with the by study abroad or the lack of courses at Mudd. At least one of the courses beyond the first year must be a writing intensive course.
Each student is assigned an H/SS advisor to help develop their program and to ensure they meet requirements.
With regards to research in #41, there is a little truth to all of the answers. Virtually all of the professors have some research going on, and obviously, it will be UG students doing that research. Some students are able to get involved early on, starting Freshmen year, others may not get involved until later. There is some summer research on campus, others look for internships outside of school. All students have research or clinic during their senior year.
Social activities at both schools revolves around the dorms at HMC and houses (hovses) at Caltech. The dorms and houses have personalities, and both schools work hard to try to place the student in a compatible dorm.