WashU is not a "relaxing" experience - especially not for premeds. (If you want a relaxing experience, go on vacation

...)
It has a friendly non-competitive atmosphere, but it will not be easy.
Scholars program for the medical school is extremely competitive, and only guarantees an acceptance to WUSTL medschool if you maintain a pretty high GPA, and get a pretty high MCAT score (I don't remember the exact numbers). It is still a good deal, as other students with the same numbers can easily be rejected, but it is not the same as some other schools, where if you are accepted into the program you go all the way through medschool with no additional requirements.