If your family is Jewish, it sounds like it could be Maimonides Elmont, which is next to Beth David on Elmont Road. This site http://www.jgsny.org/cemeteries.htm
gives a general map of the area. Look at # 24.
Also from that website:
Maimonides Elmont County: Nassau
90 Elmont Road, Elmont, NY 718-347-0095
P.O. Box 125, Elmont, NY 11003
The Maimonides Elmont office holds the records for both Maimonides Elmont and Maimonides Brooklyn. Some records exist for burial society plots.
Hope that helps,