Multiple reviewers are complaining that there are no birds at Bubali. This is not the case, but it's important to visit at the right time of day: dusk and and dawn are the prime hours to be there. We arrived a little after dawn, later than we wanted (see below for more on that) but still spotted a variety of birds there, both from the tower and from the ground. Herons, ducks, moorhens etc -- and a peregrine falcon. But in tropical midday sun there will be few birds to be seen, so pick your visit time carefully.
The tower is OK as such, but the real problem is the one that's prevalent all over Aruba: poor signage. For a relatively wealthy island, it's stunning that the government won't spend a little bit of money indicating the locations of the tourist attractions. We spent probably 15-20 minutes driving around the area looking for a way to get into Bubali. If you want to catch the morning or evening activity peak, go there the day before and do your scouting in advance!
Apart from the tower area, there are other smaller wetlands around Bubali that are worth checking, and can result in additional bird sightings.
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