The teachers and staff at the center are so competent and compassionate. Playing is always at the forefront, but they have educational themes for a full year that are cleverly integrated into the daily rhythm. The children are always doing short trips that reveal new things of their daily surroundings in the city. The social environment mixes children of various ages: there are kids of age 2 and 5 in the same groups.
I know my child's life would be a lot poorer without daycare. And it only costs about 200 euros / month. (We're paying the maximum price since we're two working parents; with less family income the price would go down to nearly zero. Also, children are eligible for daycare even if their parents are not working.)
Giving our kids a rich social life and early education without the pressures of a traditional school model is probably the one thing Finnish society has figured out. (The rest is more or less a mess right now.)