Perhaps unsurprisingly, the final version of German Operational Plan III in 1903 was nearly a mirror for the US Navy's early drafts of Plan Black drafted in 1914. There's actually a fascinating article in an old Proceedings from the period (around 1912 or 1913) where the Naval War College crew fought the whole thing out as a wargame. Of course, having mentioned it, I'm now having the devil's own time finding it in the Google Books archives of the Proceedings of the period. If I find it, I'll post it.
The Germans were expected to attack via the Caribbean, seize Puerto Rico or make a serious landing in Cuba, and use that to advance against the Southern Atlantic Coast; the final draft of OpPlan III suggested exactly that, having finally given up the idea of making landings in force against the American coastline without a closer base to operate from. Of course, as with several German war plans, it called for more than the German military possessed; it's been argued repeatedly that pretty much every German war plan was written as an excuse to leverage funding and expansion from the government, and this was no different.