Best:

Schleich horses
Plastic dinosaurs
Playdoh
Crayons and scrap paper
Huge dinosaur jigsaw (those big Australian Geographic ones - about 1.5x1.2m, about 40 pieces)
Cheap wooden train set
Swingset
Sandpit
Little people anything
A toy gibbon with arms that velcro, like it's holding hands / legs


Worst:

Basically every other soft toy ... they only are used to pad out the beds for no apparent reason
Bike (doesn't get used much)
Anything with batteries
Anything not sturdy ...