First and foremost, plan out a couple hours to drive down/up the coast on highway 1. The views from the road are unreal, and there are about a million turnoffs where you can quickly stop to soak in the view. Take a hike! Big Sur has old growth redwoods, waterfalls, rivers and creeks, and secluded beaches and coves to enjoy. Some of my favorite hikes are in Julia Pfeiffer State Park and Limekiln State Park. Pack a picnic and take it to a beach! Garrapata Beach, Pfeiffer Beach and Sand Dollar Beach are all great options.