Whenever dealing with law enforcement, it is important to be respectful even if you are going to exercise your rights to remain silent, to speak with a lawyer, to refuse to consent to a search, or to refuse and voluntary tests.
An officer may threaten arrest, or may threaten that things will be “hard” if you don’t cooperate and “easy” if you do. However, in many cases, the officer has already determined that you are going to be arrested, so giving a statement or allowing the officer to search is not going to prevent this from happening.
Never run away from and officer on foot or try to elude a pursuing police vehicle. This is rarely successful and can sometime result in a dangerous pursuit. An officer will not be happy if he has to risk his own safety (or break a sweat) to take you into custody. Also, police dogs tend not to be very gentle in this situation.
Keep in mind that while you have constitutional rights, the officer you are dealing with has handcuffs, a taser, and a gun. Cooperate with the officer in the field (without making any admissions), and you’ll have a better chance of having the last laugh when your case goes to court.