Let's go somewhere where it's quiet
let's go somewhere quiet(er)
We should go some place that is private and free from disturbances to continue this conversation. I'm really enjoying talking with you, but it's hard to hear in this noisy restaurant. Let's go somewhere quieter and keep talking. Hi Daniel, let's go somewhere quiet to go over your annual employee review.
Let's go somewhere where it's (more) quiet.
Let us continue our conversation where there is less noise or where we will not be disturbed. Tom: Hi, Mary. It's sure crowded here. Mary: Yes, let's go somewhere where it's quiet. Bill: We need to talk. Sally: Yes, we do. Let's go somewhere where it's more quiet.