A few items are non-negotiable – a light rain jacket/wind breaker, a sun hat, sun block, warm top plus appropriate footwear. Trail running/sports shoes are fine for a half-day or even a full-day hike but boots are better for multi-day hikes and more strenuous day hikes. The rest is up to you though of course you’ll need a water bottle or hydration bladder and to bring your own back pack. To carry all your essentials.