These thoughts run through my rather neurotic mind, but I've learned that there is immense power in just starting. When I'm not working, it's very hard to get started, but once I get going, I benefit from that tendency to keep going. Then, even if I don't finish, at least I'm in a better position than I would be had I not started. And the sense of accomplishment from starting usually carries me through until somehow, it all get done. I'm particularly interested in chess and tennis.
Students typically take three or four courses per quarter.
If you're planning to study engineering, then you'd also need to take physics and calculus classes. This would leave you with just one or two empty slots, which you could fill with additional classes that interest you. For instance, you could take an introductory course or seminar in one of the engineering fields that interests you, to see whether you'd like to study this field in more depth. This course schedule would put you on track to complete any of the engineering majors at Stanford. As to sporting events, Stanford has the top-ranked overall athletics program in the country.