I have 3 DC, 10, 8 and 7. 8yo is DD.
They like (in no particular order) football, cricket, ballet, Brownies, Cubs, Beavers, Nintendo DS, Dr Who, Horrible Histories, Lego, Playmobil, Puppy in my Pocket, random imaginative games, hanging about the local Rec with mates, reading.
I imagine at an out of school club all 3 would like craft activity especially if it offered the chance to be fiddly and detailed; gardening or similar; computer games; sports like rounders and football and netball; toys like Lego and playmobil and K'nex.
Their fave TV shows include that hideous show with Richard Hammond where people fall off big bouncy things, that other hideous show where people have to make a certain shape to avoid being knocked into the water.
Their music tastes are mine really so Beatles and Frank, but they also like things like Girls Aloud, Lady Gaga etc.