...We stayed at Villa Palmira which is within walking distance of the Reserva Natural de Humacao (which may be called Reserva Natural de Punta Santiago). This 3000 acre natural reserve is magnificent. At one time, the land was drained using pumps so that sugar cane could be planted. A hurricane re-flooded the land which was then allowed to revert to its former self. Part of a pumping station remains and you can see it soon after entering the reserve.
...On the east side of Hwy 3 are lakes created by the flooded land. Also in this area is an observation bunker occupied by soldiers during WWII. The bunker is kept in reasonably good condition and you can climb into it. You can also see the barracks used by the soldiers although these have been allowed to be grown over. Between the lakes and near the ocean are well maintained paths allowing you to easily walk around and view the plants and wildlife of the reserve. The climb up to the bunker takes a bit more doing but is worth the view.
...There are many birds in the trees and on the lakes. You might also be surprised by an iguana either watching you or moving from tree to tree. You can also walk right up to the ocean. Since we were living right next door, we walked to this ocean area to enter the reserve.
...All of this is without charge and is available every day. There are restrooms and viewing platforms for all to use. From Wed through Sun, there are tours as well as kayak and bicycle rentals. You can kayak on the area to the west of HWY 3. To get there, you simply paddle under a bridge. I took 2 of my grandchildren with me and we kayaked up to iguanas that sometimes just stared at us and sometimes went for a swim.
...The Dept. of Natural Resources has put out signs along a prescribed route which describe various aspects of the area. You can follow these signs or go your own way around the large lake. We did that (by mistake) and found an area full of birds. After a bit, we paddled our way to the prescribed route and completed it back to the beginning point. However you do it, take the time to go kayaking. It is fun, good exercise and puts you in touch with nature. All this and you are only a few kilometers away from Humacao.