I'm not sure what you're expecting from "student life" but I'll try my best to address it. There aren't any organized sports or anything. There are a lot of student organizations that provide volunteering activities. There are professional fraternities that provide social and volunteering activities. You can be involved in those as much or as little as you'd like.
I feel like people are generally close and friendly as much as you can get from a class population of close to 145. If you're the kind of person to try to meet people and make friends, you can do that. If you want to stay within a close-knit group of friends, you can do that as well. There may be people who make study guides or charts to share with the class in general.
As for your free time, that's up to you and your friends or family. I happen to go to the gym w/ friends (not as much as I'd like), play some games, watch some TV, and semi-regularly eat out w/ friends. There's an incredible variety of good restaurants in Henderson and in non-Strip parts of Las Vegas. There's people who go hiking on the weekends. Henderson and Las Vegas are two pretty large cities, so there's plenty to do beyond the Strip, and I'm sure you'd like it no matter what your particular interests are.
Note that Roseman also includes the South Jordan, UT campus. I don't know what goes on there since it's essentially a different institution, but I would imagine that there's still an interconnected student body even though there aren't as many things going on. I wouldn't recommend choosing Utah unless you have friends/family there, you somehow prefer the weather in Utah, or you have some other very compelling reason.
There is a block assessment every two weeks, as well as other assessments and assignments throughout the year. For me, it was generally a lot of studying closer to the end of the two week cycle and not as much at the start, but consistent studying would be better than pulling all-nighters. During my first year, I had plenty of free time. For second year, I imagine that there won't be as much free time except on weekends.
I am originally from California as well.