<p>WashU is really competitive and pre-professional. I think it would be one of the schools which is least like Brown. I think some LACs might have a similar atmosphere, but definitely not schools like WashU.
Yale is similar to Brown in the sort of students they look for and they have a large number of cross-admits.<br>
Schools on the west-coast will be generally pretty chill. But without the New England weather and the Ivy League history/ atmosphere.</p>
<p>Advice: Open-curriculum, S/NC,ABC are things which are incidental.
Look for schools which ask for similar types of people. While Amherst too has the open curriculum, it attracts different people and has a different atmosphere. And while Yale has requirements, different grading and professional schools, it attracts and admits similar people and gives off a similar vibe.</p>