Line a small sheet pan or oven-proof dish with parchment paper.
In a medium-sized bowl, whisk together rice vinegar, lime zest and juice, honey, ¼ teaspoon salt, garlic, ginger, and olive oil.
Place salmon on the prepared sheet pan. Pour 2 tablespoons of the marinade on top and sprinkle with the remaining ¼ teaspoon sea salt. Allow to marinate for 10 minutes.
Toss diced cucumber and chopped cilantro in the remaining marinade until combined. Set aside.
Bake salmon for 8-10 minutes, or until cooked to your liking.
Optional: Broil salmon for 2-3 minutes for a golden top.
Top salmon with marinated cucumbers and cilantro, and serve immediately