The small conversation you can have with your villagers, and i mean actual conversations, not the ''get me a fruit, i am hungry''
The construction you can do without anyone really caring

The gardening ( everything regarding gardening included ) that you can do and everyone is like ''K''

The island can be really fun for the bug hunting so you can get some real cash, ha ha
Even though the tours can get tedious at times, they sill are fun for a few minutes
The community, if it's here, or on some other ACNL forum, doesn't matter.
Visiting other people's towns, i like to see what others did with their towns.
The clothes... oh the clothes, i have 3 of the 4 museum room you can buy, FULL with complete ''costumes'' i wear from season to season or from event to event, or whatever to whatever.
The customization to all the furniture.
And that's probably it

can't think of more that i like about the game.