First congratulations!!
I have a kid at Brown who has thoroughly enjoyed and benefited from the schools resources and culture. He is an applied math concentrator that has enjoyed the sense of teamwork, curiosity and independence Brown is known for. If you walk the campus I don’t think you will find it to be discernibly any “hippier” or “pot smoking” then most elite schools.
That said the school is what it is. There are athletes, poets, political activists, geeks, and in many cases all of the above embodied all in one student.
My kid choose the school (among several options) because of the open curriculum and the opportunity to explore academic areas of interest he might not be able to if at a school with a more structured curriculum. He started a venture through the Nelson center for entrepreneurship sophomore year that has gained some momentum given the support of Brown staff and network. His one regret seems to be that his time on campus is fast approaching an end and he wishes he could have taken several other classes that he had to skip to pursue his start up.
In short the school lived up to its reputation as the happy Ivy, he was never driven by a sense of competition and felt fully supported and motivated to pursue academic, social and professional interests.
I hope you make the decision that works for you but I know dozens of Brown students and have not heard one who expressed regret at their decision to attend.
Happy to try and source answers if you have any specific questions.
Lastly you may want to change your user name as it makes you easily identifiable and ED was intended as binding.