Community college athletics in the middle of downtown? Not much from what I've seen as far as a basic gym for students open certain hours and a swimming class that takes place at the YMCA somewhere down the street. There's a yoga credit classes as well others things but just basic, but hey its community college.
The student center is really between the small art gallery and lunch area so it's easily hidden unless someone were to point it out to you.
Library is basic and a descent size, everyone respects privacy and quietness for the students who nap there.
I see some activities done weekly by the end of a semester in the so call "Student center" area which sometimes might be popping or just filled in by the members who support the club's ideals.
In general I put El Centro's aesthetic above the other possible DCCCD colleges open to me cause of the area is walkable to do other actives AFTER class. The Dallas Museum of Art and other galleries/ museums aren't that far off from a quick DART ride and walk. As well as new business opening by, don't be afraid to explore your area than JUST the Bank of America's underground lunch area. Promise you won't be disappointed!