I'll be in Chile for a week in August. Heading to Valle Nevado to go snowboarding for 7 days. I can arrange my bus transfer to stop off either at SCL or in Santiago and am debating spending a few days there vs. going right home. The Human Rights Museum and Natural History Museum sound interesting and I'm a bit of a foodie, esp. when it comes to street food. What would you do ? Tack on a few days or come back as part of a larger trip ?