Hmm mani seems like a snack. Sopa could be a main course. Helado is a dessert. Torta could be an entrada? I'm not sure. But well this question made me hungry.
Incorrect, adding the word tú does not go with the rest of the sentence.
The answer would be diríais
You could set up like this
Me gusta (mira la tele en el verano)
Si, me gusta jugar (el futbol de americano)
Si me gustan ir a las fiestas (porque me gusta bailar )
Si, me gusta bailar (porque es divertido )
Words in () are just examples thag you can use if you want but before those are sentence starters