Take a quick hike down to the beach and catch amazing sunsets over Puget Sound. The beach is sandy, but be careful as it has some driftwood that's washed up.
Discovery Park and its beach area great for walking, running, photography, and taking in a sunset. If you want to put your feet in the sand, head down to the western most part of the park. This beach is a sand beach with an iconic lighthouse at the end. Dirftwood also washes up on the beach providing some cool contrast.
If you need a bite after the beach, head to the Ballard neighborhood, which is about 10 minute drive northeast of the park.