The first quote-
Alice: "I'll play you for it. Rock, paper, scissors."
Edward: "Why don't you just tell me who wins?"
Alice: "I do. Excellent."
I think it means that Alice and Edward are fighting over something not that important, something they both like, like who gets to drive or something. If it was important they wouldn't decide it over rock, paper, sissors. Also, i know Alice could see the future to see who wins, but couldn't Edward read her mind to win?
Second quote-
Bella: "Oh, Mike! How will I go on?"
Bella is probably being sarcastic over something little. Again it's nothing big, because she wouldn't confide in Mike about it.
Third quote-
Tanya: "Ah, Edward. I've missed you."
OMG! This one gives a lot away! Obviously Tanya is in it, so it probably involves the rest of her family. Most people are saying she is in town for the wedding, but that doesn't make any sense. Why would they invite more vampires to the wedding? It would just cause more conflict with the wherewolves. Also if Tanya has a thing for Edward, why would she be there for his wedding to another girl? I think they are in Antartica. I think Edward and Bella and the whole Cullen family is in Antartica because Bella is going to be turned into a vampire. In Eclipse they did talk about Antartica as a possible place for them to go.
Fourth quote:Emmett: "Oooo, scary."
I think Emmett is just being sarcastic. Somebody, probably Bella or Edward jokingly threatened him and since he is big, strong Emmett, he is not really threatened, or at least not showing it.
Fifth quote:Bella: "Jasper? What do vampires do for bachelor parties? You're not taking him to a strip club, are you?"
Again, this gives a lot away! Edward must being having a Bachelor party and Bella is worried. She must be trying to ask Jasper about what they will be doing. I don't believe Edward would ever go to a strip club, he is way too much of a gentlmen. He will probably have a hard time having a Bachelor party anyway, because Bella won't be able to come.