Ill divide this up

Things around town:
a)People who speak, say intresting things, and change what they say every so often according to whats going on.

b)People leave town, in real time, or go home, around Hyrule field.

c) MM, People do things at certain times, have stories to tell, and quests to help with.

Games:
Im not really gonna ask for anything here, as Im sure Nintendo can come up with something new then I could, Just new things, maybe some old things, but you need to have a reason to play them more then once and they need veritiy.

Money: Things to spend your money on. Shops, customising, investing in town, whatever.

Town design:
Something that suggests the town is large even without it being needed to explore every inch, various ally ways with gardens and such, maybe a hybred between mock tudor design and victorian, something asthethic.

A better castle with better gardens and actual rooms.