Double Peak Park in San Marcos just opened, with much acclaim, and I took a peak a few days ago.
At 1644 feet (and one of the highest points in San Diego county), the unobstructed 360-degree views from the top of this newly opened park are incredible, even on a hazy day when I was there. Better than the views atop Mt. Soledad in La Jolla which are darned impressive.
You wind your way up Double Peak Road off San Elijo, the main road through the master planned community of San Elijo Hills in San Marcos, with views in all directions. There is a parking lot midway, but take the road to the very top to enjoy the best views, picnic tables and a play ground.
There are hiking trails in this 230 acre-park, most of which is undeveloped, and ample parking plus an artificial rock climbing area and amphitheater. The day I was there it was virtually deserted, and despite the haze the views were spectacular - to San Bernardino to the northeast, west to the ocean and the Batiquitos Lagoon, south to San Diego. Can't wait to take a hike on a clear day.
ENJOY THE SHOW!!