A few nice Key Largo Hotels images I found:
MM00005179
Image by Florida Keys–Public Libraries
Florida East Coast Railway, Key West Extension. Steam shovel #2 working on Key Largo in February 1907. Photo from Flagler Museum, donated by Lois Simpson.
MM00005193
Image by Florida Keys–Public Libraries
Florida East Coast Railway, Key West Extension. Hand drilling rock, Camp #2, Key Largo. From the Flagler Museum, donated by Lois Simpson.