good soft factors e.g. awesome volunteer work, activist work, etc, are more important thanj just double majoring.
i'd suggest you focuisng on the things that you *want* to do
i only have one major - history - but i was pretty heavily involved in one extracirrcular, and it didn't seem to hurt me. although i do wish i had figured out that i wanted to go to law school so i wouldn't have slacked off so terribly during freshman year.