Ok, for the donation...you must follow the sequence...
1)Bridge = 200,000 Bells
2)Fountain = 500,000 Bells
3)Lighthouse/Windmill(choose either 1) = 1,000,000 Bells
So the best way is straight donate full amount(easier and safer), or else you can accumulate your donation
each item, remember dun donate over...
For example:
For the new bridge, u can straight donate 200,000 or slowly accumulate up to 200,000(Pelly will tell you when the donation is enough to build something)...
Like me I wasted almost 300,000 Bells coz 1st time I straight donate 500,000 Bells then come up with new bridge...then I have to donate again 500,000 Bells for the fountain...(anything wrong, pls correct me)
For the feather I dun think everybody will go and donate it...the donation is damn high...(or else ppl use cheat)

, better use Bells to buy furniture...
Green feather = 100,000,000 Bells
Blue feather = 200,000,000 Bells
Yellow feather = 300,000,000 Bells
Red feather = 400,000,000 Bells
Purple feather = 500,000,000 Bells
White feather = 600,000,000 Bells
Rainbow feather = 700,000,000 Bells
Animal Crossing: City Folk Hints LinkThanks for clearing my doubt.
you can adjust the time either at the Wii System Menu or In-game itself. for me i adjusted mine thru the Wii System :TimE&Date Settings~ my time is 2 hours earlier then real-time.