If you are working in nature related environmnet, you must like nature. As you mentioned, many fall within the multi-million dollar range. First of all, statistics of tourists arrival to Singapore. The local market's support is also important. You must develop something that interest local audience.
Financing can come from the traditional finance houses.
Thanks for elaborating. Whilst the attractions have social obligations recreation for family, at the same time, they must also not run at a loss. The association and Tourism Board assist the members and market the attractions collectively to attract traffic flow into Singapore. At the same time, individual attraction also does their part in niche marketing. They may select certain market that appeals most to their attraction or they even develop new markets that has not been identified in the industry.