Ramadhan

I just found out that puasa month for Muslims starts tomorrow which means no food and drink for the hours from approximately 4:30am to 6pm. Whoa! That's an awful lot of hours to go without food and water. I wonder how it'll be here in Jakarta during Ramadhan. Will it be rude if I were to go out for lunch and have a huge feast while (almost) everyone here is fasting?