Vocabulary: Making suggestions

Ryan: Aziz! How was your holiday?
Aziz: It was great thanks. I had a wonderful time.
Ryan: You've even brought the sun back to Manchester with you! Good work.
Aziz: Yeah, it's glorious outside, isn't it? Bright and sunny. So, what shall we do today?
Ryan: Well, we could go for a walk along the canal to Old Trafford.
Aziz:  Nah, it's too hot to walk.
Ryan: What about going to the John Rylands Library? It'll be cool in there because it's made of stone.
Aziz:  Errmm... No, I'm not in the mood for that either.
Ryan: How about running through the fountain in Piccadilly Gardens?
Aziz:  Now you're just being silly!
Ryan: Why don't we just buy an ice-cream and sit and watch the world go by?
Aziz:  That's a bit boring, don't you think?
Ryan:  Right, that's it! I give up! You don't want to do anything I've suggested. Why don't you think of something?
Aziz: To be honest, I'm not sure I can be bothered to do anything. It's boiling.
Ryan: Ok, then. Brilliant. Let's do nothing and just wait for the rain.

When Ryan says "Ok, then. Brilliant", do you think he is happy or angry and frustrated? What's his intonation like: is he serious or sarcastic?
What different phrases did Ryan and Aziz use to make suggestions? Answers after the jump:

shall we + base form     What shall we do today?.. Where shall we go?... Shall we go out tonight?
could + base form         We could go for a walk.... I could cook a lasagne .... They could meet us there
what about + gerund    What about going to the library?.... What about having a coffee?
how about + gerund     How about running through the fountain?...... How about meeting us there?
why don't we + base form ....... why don't you + base form .......... why doesn't he + base form ......
                                      Why don't we just buy an ice-cream? ....... Why don't you think of something?
Let's + base form          Let's do nothing....... Let's go out tonight ....... Let's have a coffee 

Try and read the conversation with a friend or practise the conversation yourself.
Think about the intonation. How does Ryan feel? How does Aziz feel? How do they show their feelings when they speak?
Use the phrases to create your own conversation. Have a short discussion with a friend about where to go for lunch, what to do at the weekend, what to do in the evening etc