chill your melon for at least an hour or more. slice melon in half. remove seeds and pith with a wide metal spoon. slice melon as you like, small bites or larger thin triangle shapes.
place in bowl and toss with rice vinegar and spices. top with crumbled feta and a drizzle of olive oil. serve chilled. optionally: let melon pickle slightly in vinegar for an hour or two before serving.