Amazing views and it is an easy hike. Very highly trafficked because it is doable for anyone. There are some stairs and tunnels/caves but that makes it more interesting and fun. Once you make it to the top, a very courteous gentleman will offer to place a "finisher stamp" on your map or ticket. The ticket must be purchased at the entrance and it costs $1 per "walking-in" individual (CASH ONLY). There is nice space available for picnics at the bottom and also several benches and rest areas along the hike. Took me about 1 hour to complete and definitely recommend it to anyone.
Arthur S. on Diamond Head (Le'ahi) Summit Trail
Great short hike to see the sunrise. Get there right as the park opens at 6 am as the crowds are heavy. Takes 20 minutes to get to the top but the view is spectacular.