This is a wonderful area for a family to explore. Rosario Head trail is at Deception Pass State Park on the north side of the bridge over Deception Pass. The CCC museum is closed for winter, but it is definately worth a visit if you go when it's open.
Watch the wobbling little tykes on the Rosario Head trail - it's a long drop to the water. There's a nice wooden sculpture and native American legend to read before the final ascent to the top of the Head.
Goose Point trail is located at the South side of the Deception Pass bridge on the east side of Hwy 20 (opposite the parking lot). Access is via the trail under the bridge and to the other side. You have a few choices; we started on the Perimeter Trail and went to the other side of Goose Point, then took the summit trail and back down to meet the Perimeter trail. There are lots of big madrona trees on the cliffyish, south side of Goose Point.
This is always a great area to spend the day. There is also a very nice wetland trail at Cranberry Lake, and of course the beach, which is home to some of the most colorful beach stones I've ever seen!