In a large bowl, combine arugula, peaches, tomatoes, feta and nuts.
Drizzle with olive oil (I count to 5 and then stop).
Drizzle with about 2 tablespoons of balsamic vinegar and season with salt and pepper.
Toss and taste to check seasoning.
If needed, drizzle with extra olive oil or add another splash of balsamic vinegar.
Serve immediately.