Wow! We were taken to Lyon Arboretum by a local. It is a other worldly place, with plants and flowers that you won't see anywhere else - gorgeous blooms, weird shapes, and views across the valley that will blow your mind. They close at 3pm, so be aware, because you need at least two hours. There is a waterfall at top of trail, which may be running, maybe not. You need to be in shape as it is uphill most of the way. Not for flip flops - wear closed toe shoes with tread. It's a rain forest, so recommend bug spray for mosquitos. There are pavers and/or paved path until the last section which is easy but watch your footing. Do not go if it has rained that day because paths will be very slick. I loved this place and it is not a tourist trap so very uncrowded.

My recommendation, even if you see the online reservations booked up, call their number and ask if it is okay to walk in. They block out certain time periods for classes that might fill the parking but don't crowd the walk paths. The staff is very friendly and helpful. Even though the free parking near the arboretum visitors center had open spaces for our visit there, afterwards, we moved down to the pay lot for the Manoa Falls hike after the arboretum visit. Free plus fee and totally worth it all the way around. Do not hesitate to buy some bug spray or wipes at the Falls lot if you were not already prepared.

Having been to Honolulu a number of times, we looked for something to do that we haven't done before and the Lyon Arboretum was it. Very scenic with many lovely plants. While you can do this on your own, a guided tour will add to your experience. There is a lot of walking and on uneven paths, so if you have mobility problems you might want to rethink coming here as the pathways are not wheelchair friendly. Do wear good walking shoes, not sandals.

Beautiful place to escape the crowds in Waikiki. Main trails are marked and pretty well maintained. The other trails are not and very rough/muddy/rocky but pretty. Main trail to waterfall is rocky and slippery in places. Recommend hiking boots for sure.

Went to Monoa falls but was pleased to see this open so we walked up and spent some time looking around..what a treasure in this verdant valley. Open 9-3 M-F looks like appt only on weekends and holidays . Who lives in those cute cottages? Botanists? Cool