Some general notes from my trip.
Seawatching:
I found that morning and evening sea-watches from the north end of the island (i.e. around Corralejo) produced nothing more than Cory's Shearwaters - I'm sure other birds must pass between Lanzarote and Fuerteventura, but I guess most pass down the east and west sides of the island. This was reinforced when watching birds from the lighthouse north of El Cotillo, as birds heading south were often some distance out, suggesting they had come down the west side of Lanzarote. The east side of Fuerteventura would be good for seawatching, especially given the predominant NE winds, but the rising sun makes it very hard on clear mornings.
The lighthouse is well placed for seawatching in the morning, and provides some shelter from the wind, but it is only just above sea-level, and whilst providing a good panoramic view of the horizon, it is a little low-dow, and many birds were lost in the troughs of the waves before being able to get a good view (picking up any Petrels from here would be hard work during a good blow). The town of El Cotillo is more elevated, but set a little further "inland", and birds were passing by a little further out than further up the coast.
Los Molinos Reservoir:
Still a good site, but not as productive as in previous years when I have visited. There were few waders here (although this made picking up the Yanks easier!), but plenty of water. Muddy areas at south end and in the inlet along west side were the only areas of wader habitat here. There is a hide midway down the east side, but it was locked on my visits. As others have reported, the access to south end as described in Clarke has changed a lot, and there is no longer any vegetation or Tamarisks at the end of the reservoir. In-fact, there is little point accessing from the south end, except to check the trees and scrub around the goat farm.
Catalina Garcia:
Still the best site on the island, and plenty of water here during my visits. There is a hide, but its locked. Worth a visit, especially in the mornings.
Caleta de Fuste golf course:
Sadly, I never made it to this site, but from the air, it looks like great habitat for migrants, with plenty of grass, vegetation and some pools. I bet there was a Buff-breasted Sandpiper here too....