CREATE TABLE table_name_80 (zone VARCHAR(255), name VARCHAR(255), max_people VARCHAR(255), group_s_ VARCHAR(255))
Which zone has max capacity of 23 in a group under 2 at Robbers Roost?
    
SQL: SELECT zone FROM table_name_80 WHERE max_people > 23 AND group_s_ < 2 AND name = "robbers roost"