You can break this down in Volume (based on demande sizing) X Price
# people going to amusement park X # time they visit / year
People visitng parks can be segmented in two categrories
- locals : local population size with hypothesis on family size X % of local interested in park (based on age probably) X # visit / year
- Tourist : # of pepole visiting singapour as tourist X % of tourist interested in parks. (We assume only 1 visit / year)
- revenu from tickets : maybe consider the average duration (in days)
- revenu from goodies & food & hotels
I think this level of granularity can be handled in quick market sizing.