The Amador Causeway is a 6-kilometre strip of land connecting three small Pacific islands — Naos, Perico, and Flamenco — to the mainland at the Pacific entrance of the Panama Canal. It was built using rock excavated during the construction of the canal, dumping the spoil into the Pacific to create a breakwater and, in time, a road. The causeway is a good place to walk or cycle in the early morning or evening, with views back across the bay to the glass towers of the modern city on one side and the Pacific open water and the canal entrance on the other.
The causeway is also where ships queue while waiting for their canal transit slot; after dark you can see their lights stretched out across the water, a long chain of container ships and tankers waiting their turn.
The restaurants on the causeway — mostly seafood and international — are more casual and more reliably comfortable than those in the Casco Viejo, and popular with local families and couples on weekend evenings. There is a small marina, a Frank Gehry-designed biodiversity museum (the Biomuseo), and bicycle rental available. It is an easy taxi ride from central Panama City, and the round trip on foot or bike along the causeway to Flamenco Island and back is about an hour at a leisurely pace.
The causeway is also the approach to the Biomuseo, Frank Gehry's collision of multicoloured canopies, which houses a serious natural history museum on the formation of the isthmus — the meeting of North and South American species three million years ago, one of the most consequential biological events there has been.