A (better) Market Area (in each village)
You should be able to:
-- Catch fish and sell/trade them at the market.
-- Trees should also bare fruit which too can be sold/traded. Of course, fruit that's not native to a village(or rare fruit in general) will sell for lots of ruppies.
Realtime "clock" gameplay
For instance:
-- Horse racing every Saturday!
-- Were you should be able to bet on the race. A cleverly designed stats system could allow you to narrow your bet to near 50/50. Or, you may wish to participate in the race yourself, choosing to compete for ruppies or prises. Perhaps even getting someone to bet on you/Epona while you race for prises. Win the race, claim you prise, then you and your accomplice can split the ruppies. hehehe
(I'm surely getting carried away now)
-- Thursdays seem like a great day to go Raft-racing down the rivers of Hyrule.
*People may grow impatient with the whole realtime clock thing. So Nintendo could simulate it instead. Keeping the days in the week, but one "game-day" could last for just 2 hours in the realtime.
-- People might want to travel from village to village. Why not give 'em a lift on Epona if you aren't in a hurry? Sure, all in a day's work of a hero! It'll cose 'em a fee of course!
Bonuses: Incentive to play again
-- Each boss should have a
secret "artifacts"(for lack of better word) that Link can cease during battle-- you'll have to figure out what those artifacts are for each boss. For instance, The
Tooth of The Fire Dragon, or The
Scale of the Sea Serpant. Besides showing them to villagers as proof of your greatness, gaining respect and listening to their salutes, you should be able to trade them to various people next time you start a new file, for some cool items/goodies in return. (too wishful?)