• Let’s plan our year-end holiday.
• Let’s go to the mountain.
• Why don’t we go to the beach instead?
• Let’s talk to them at dinner.
• How about going to the cinema this Saturday?
• What about having some tea at that café?
• Shall we have a picnic by the river?

Accepting:

• Yes, let’s do it.
• Okay. Let’s.
• Yes, I’d like to.
• Yes, I’d love to.
• What a good idea!
• Why not?
• Yes, with pleasure.
• Great!
• That sounds great.

Refusing:

• No, let’s not
• No, let’s not do it.
• I’d rather not.
• That’s not a good idea.