Volunteer work can give great experience, for which an agency or elected official would not hire a you for pay. Travel to Canada, Mexico and California demonstrates familiarity with other places and cultures. Because you want a career in government, service on the Student Senate is right on track. A fraternity treasurer knows bookkeeping. While campus activities are good, do not overemphasize them.
Brief entries are enough.
Tutoring shows ability to teach. Social service agencies like devotion to the poor and disadvantaged, and it is never a negative. While some of your classmates may not value church activity, the employer probably does and it is rarely a negative. While the general rule is never to mention activity prior to college, being an Eagle Scout is very prestigious, hence overrides the rule. Writing skills are in demand.