Team Yofa: This one has ran its course -- archiving.
Solution:
The hint "Rivest's breakfast" refers to Ron Rivest's "hash", specifically the MD5. Like any cryptographic hash algorithm, it's difficult to compute backwards. This puzzle was created by doing a little bit of that...
- The hex value of MD5("ENZYME INACTIVATED") begins with 3739211
- The hex value of MD5("SHOESTRINGS UNCOATED") beings with 12147750
Therefore, N37 39.211, W121 47.750