I would ask for a bottom floor unit in one of the following buildings (in order of preference): 408, 406, 404, 402, 407
If being close to amenities doesn't matter, then you may like 501 or 502 (most recent construction).
Summer Bay tries its very best to accommodate requests (their customer service is stellar), but they do have certain check-in days for certain buildings. Sunday check-ins offer the best selection of buildings.
Cindy