Concept for a personal project 'aRevolution'.
Richer and more influential citizens, who used their connections well or were smart enough to use the economic growth since the aliens' arrival, live in floating mini-islands, hoovering over the Atol. Each island has self-sustaining energy source, temperature controlling and air purification systems. Small docking stations with syntetic fuel generators and/or ion chargers take care of the vehicles.
Depending on personal preferences (and capacity of the wallet), floating islands can also have luxurious pools, gravi-chambers and other attractions. They can also branch out and to create additional mini-islands but they need to be connected to the main one and its power source.