One of the best features of UW is the Undergraduate Research Program:
https://www.washington.edu/undergradresearch/
https://www.washington.edu/undergradresearch/students/
https://www.washington.edu/undergradresearch/about/
https://www.washington.edu/undergradresearch/symposium/
A lot of top research in a lot of areas:
Also, very few of the 180 majors at UW (some engineering, biochemistry, business administration, and computer science) offer admission to a small number of freshmen. Many students, like OP, are undecided about their majors when they enter college.
https://www.washington.edu/uaa/advising/academic-planning/majors-and-minors/overview/