As far as Hiking Costa Blanca, this is one of the most beautiful hikes in the region. It is a fairly strenuous hike, especially the first half, because some parts are steep (vertigo!) and have loose stones. The trail is marked reasonabaly well. The views along the way are stunning and surprising, and you’ll pass the ruins of Fort Bernia. After the walk, relax in restaurante Vista Sierra de Bernia or Bon Vent, both near the start / end point.
This walk as part of hiking Costa Blanca is about 9 km, which can be done in about 4 hours. But if you take a some time for the views and the fort plan for a bit longer. The best is to leave in the morning, so you will enjoy the clearest views.
For a complete despcription of this walk, visit the Walks in Spain website.