Should I take the roadside field sobriety tests?

No. Politely decline. I always recommend against taking the Roadside Field Sobriety Tests. (HGN, Walk & Turn, One Leg Stand and Portable Breath Test) In Washington State or Seattle, these tests are voluntarily , unreliable and difficult to complete in the best of conditions. (think traffic flying by in the dead of night, bad weather conditions among many other factors) Remember, you are simply building a DUI case against yourself. ( usually not a good idea ) You can be cooperative and respectful of the officer or trooper without taking these tests.