Are my senior course selections challenging enough to get into Boston college, Bates and Colby?
AP Lit
AP Stats
AP Microecomics
AP Macroeconomics
AP Comp Gov
AP Euro
Spanish 4 Honors
Internship with Edward Jones (investment/financial management company)
6 APs is rigorous enough for any college, and remember they compare you only in the context of your own school. It may be more beneficial to just ask your counselor and peers how many they are taking to gauge how competitive you are…
^^ I agree… it also depends on how well you actually do and who you become in the context of your schedule. Anyone can take these courses… but it matters what you do with them.
This is a VERY rigorous schedule. Make sure you can handle it. But no college would find fault with it. 
It’s plenty rigorous. Two questions: Are Macro and Micro separate full-year courses, or one full-year course? It’s should be fine either way, as either 6 or 7 full-year academic courses plus an internship would be OK.
Also, why is there no science? If you’ve already taken four years of high school science, including Bio, Chem, and Physics, and you took honors classes, then no science here is probably fine. If not, it seems taking AP Euro (when you already have at least two other soc sci classes) instead of science might not be the best choice.