In a small bowl, whisk together the olive oil, lime juice, lime zest, salt, and maple syrup.
To a large bowl, add the watermelon, cucumber, red onion, mint, and jalapeño. Drizzle the dressing over the top and toss to coat. Add pepitas (or pistachios) and vegan feta (optional) and toss gently until just combined (avoid over-stirring). Taste and adjust as needed, adding more salt or vegan feta for saltiness, jalapeño for heat, lime juice for acidity, or mint for freshness.
Best eaten fresh — leftovers become soggy and mint discolors with time. Not freezer friendly.
*Nutrition information is a rough estimate calculated with pepitas and without optional ingredients.