Oh, you will need a US Visitor's Visa to come to Saipan if you're not a US Citizen. CNMI's immigration was Federailized by the U.S. last 2009. Filipino workers continue to work here as long as they have a CW1 permit.
If you're a Pinay you'll have no problems visiting Saipan because there many Filipinos here. Many vsitors consider this a their Paradise Island esp. for honeymooners. Place is just romantic not only for couples but also for singles. Who knows you might find your Special One here. I will surely be the first one to welcome you. Regards.