I was just wondering, what exactly should i get done on my 30,000 mile service. I know the dealer is gonna try to charge me 300 bucks for mostly bull**** stuff. But what would you consider "a must"

Look in your owners manual. It lays out the whole maint schedule even has a book to date & mileage of each service.
any way, change oil, replace ripers, air filter, in cabin air filter if equiped, trans service, cooling system flush, & a multi point check.