1. Return Sceptre
oh.
Yeah, I guess there's some more, but really number 1 up there is the point of the game. To 1-up the Wizard with his zapping away into thin air in that early scene about the Junimos. What a showman, I just call him the local magician.
He hates that.
The next best thing to #1 there for Island life is the Island Obelisk but that's a bit of a grind. So before getting that, I usually plan to do a minimum on the Farm before 8am when Willy finally lugs his posterior over to unlock his shop. Use at least Quality Sprinklers (leftover from Iridium Sprinkler upgrades) and set up something that takes a while to grow and be reharvested:
Ancient Fruit
Pineapple
Fruit Trees
I usually plant Mixed Seeds as well if I have the Sprinkler space as you accumulate them there and they give:
Pineapple (woo!)
Blueberry (reharvest, so OK)
Melon (need on Ginger for a quest)
Rhubarb (makes decent Wine or Jelly)
As you harvest the Melon and Rhubarb and replant Mixed Seeds, you enrich for Pineapple and Blueberry so it works out pretty nicely.
So I usually end up checking once a week,
BUT
You'd think this would be a safe and casual strategy, wouldn't you? RIGHT??
Nope.
Farglebarging WEEDS will spawn pretty frequently and infiltrate and destroy your crops so you can't just leave the Island Farm be and check like 3 seasons later and expect at least a field fulla Ancient Fruit and some other goodies. No nono you'll instead have a lazy patchwork of weed tendrils laced through with 2/3 of your crops *and sprinklers* destroyed. Weeds on your farm are pretty tame compared to the Ginger kudzu you have to deal with.
Frankly you should praaaaahbably check at least once a week, yes I know that's wayyy to often as once a season is really a nice sorta cadence for the remembery-challenged of us. But maybe making it your Wednesday thing instead of actually making sure Pierre isn't closing the store behind your back (I'm totally not just chatting up Caroline...) is a reasonable idea.