Rinse all produce. Peel cucumber using a striped pattern (leaving some of the skin on). Once peeled, dice cucumber and place into a large bowl.
Remove rind from watermelon and cube. Place into bowl with cucumber.
Finely chop onion, cilantro and radishes. Remove avocado pit and skin, cube avocado. Place into bowl with cucumber and watermelon. Stir until well combined.
Over top of the salad mixture, drizzle honey, olive oil, squeeze juice of both limes, and top with flaky sea salt. Wait to add dressing until immediately before serving, stir and enjoy!