"I was hanging with the players," he added. "I went to the academic advisers and toured around campus. "
Warren, who has also officially visited North Carolina State, attended North Carolina's ‘Late Night with Roy' event on Friday night.
"It was crazy," he said. "A lot of people knew who I was walking in and it was kind of full to capacity. It was a lot of fun."
"They introduced the players and had a 15-minute scrimmage," Warren added. "They are going to be nice."
Reggie Bullock was Warren's host throughout the visit, but he also said he spent quite a bit of time hanging out with James Michael McAdoo and Harrison Barnes.
Warren wasn't the only prospect on his official visit. UNC commitments Marcus Paige and J.P. Tokoto were on campus taking in the festivities as well.
"It was cool," Warren said about being with Paige and Tokoto. "They were all trying to get me to commit. Nate Britt was there also."
The visit finished up Sunday morning at Roy Williams's house.
"We had breakfast with him this morning at his house," Warren said . "He has a real nice house. I just got to sit down with him."
"He wants me to come in and he said he needs guys that can score the basketball," Warren said. "He said he made me a priority the whole summer and with Harrison possibly leaving next year, he wants me to play that role."
Originally Warren's plan has been to take his visits and make his college choice in late December, but the senior at Wolfeboro (N.H.) Brewster Academy said he's going to make up his mind when it feels right.
"I don't know yet," he said when asked about a timetable. "Whenever I feel like I want to do it, I'm going to do it. I'm going to Georgetown next weekend."
To go with his trip to Georgetown, Warren, Scout.com's No. 22 overall prospect, is planning to take an official visit to Florida, but he hasn't set a date.
Warren was accompanied on his UNC visit by his parents. He said his father, a former NC State player, is supportive of whatever decision he makes.
"Wherever is good for me -- he told me I need to make the decision for me," Warren said. "A lot of people think I'm going to go to State, but I just want to weigh all my options and play it out.