"It was great. Got to see the campus, the stadium," Casillas said. "Got to hang out with the guys a little bit. I got to watch practice. It was good. It was an in-depth visit."
Casillas has also taken official trips to Illinois (Sept. 9), Kentucky (Dec. 3) and Connecticut (Dec. 10) and is strongly considering those four scholarship offers. He said each school has endearing characteristics.
"I don't know because there's so many things that you can think of," Casillas said. "Like Wisconsin is probably the biggest program, the name stands out.
"Connecticut is the closest. So you know that my mom loves that about Connecticut.
"Illinois is a program with a new coach [Ron Zook], so you know anything could happen with a new coach. You could have a good season and they could have a breakout year this year. They have a lot of young talent over there.
"Kentucky, they are basically saying I could come there and start early.
"There's a couple things you could really think about. So I don't really know what do I want? The order I want it in. It's kind of tough."
Wisconsin is recruiting Casillas as a will linebacker, while his other three suitors are looking at him primarily as a strong safety but also as an outside linebacker.
Casillas said that Penn State recently began recruiting him but that he is not very interested at this point.
"Penn State talked to me the other day but I'm not really considering it. But they're trying to press up on it," Casillas said. "They want me to come up there [Jan. 14]. I don't think I'm going to go up there."
The Nittany Lions have not tendered a scholarship offer.
"I guess I was a late recruit. I think they just watched my film the other day," Casillas said. "I guess they've got to run that by [Penn State coach Joe Paterno] and see what's going on. But I don't think that I'm going to do that option."