If the El Nino is on the stronger side then it is certainly likely that the Galapagos will experience increased rainfall.  However, at this time, it's a bit early to say, so I would recommend monitoring future ENSO updates.  In general, the closer we get to November/December, the better the predictions will be.  In the absence of other information, I like to point folks to "climatology" (the average) which is presented here:

http://www.cpc.ncep.noaa.gov/products/precip/CWlink/climatology/Global-…