Ok, I compiled a list of everything I've seen listed as likes or dislikes for villagers. OCD-afflicted? Maybe, but here it is...

Colors:
-Red
-Yellow
-Blue
-Green

Actions:
-Dancing (if a dislike, won't party w/GC)
-Resting
-Exploring
-Lifting
-Swimming
-Running
-Playing
-Work (sort of intangible; can affect how well they learn or do anything)

Other Living Creatures:
-Crowds (if a dislike, won't celebrate or party)
-Bees
-Monkeys
-Fish (applies below as well)
-Butterflies
-Flies
-Birds
-Snakes
-Ants

Food Items:
-Coconuts
-Fruit
-Berries
-Turnips (if a dislike, won't usually harvest crops)
-Crab Meat
-Whale Meat
-Papaya
-Bananas
-Fish

Nature, including Human Nature:
-Sunlight (still haven't figured out what effect this has)
-Flowers (if a dislike, won't enjoy the garden, but will honor the dead, temple, etc)
-Caves
-The Ocean
-Rocks
-Rough Wood
-Drift Wood
-Wind
-The Dark
-Herbs (did easily train a Master Doctor who disliked them)
-Bushes
-Surprises
-Jokes

Miscellaneous:
-Laundry
-Medicine
-Drums