Is La Paridilla (spelling?) still in business, right before the traffic circle and stadium. It also had a pizza restaurant right there as well.
I always enjoyed their steaks, outside setting, a little rustic, but great food.
Jump on a guagua at the main gate or take a taxi. It would be about a 10 minute ride roughly?
Depending on which resort you are staying at, some do have a la carte restaurants that feature steak. I know Puerto Plata Village had its steak restaurant - and served mighty fine steaks at that.
Marlie