The phrase "Let's
___" is well-known to English learners. However, learners often over-use
"Let's ___" and use it in situations where it isn't appropriate.
When can you say "Let's
___"? You usually use it when you're suggesting something that you're sure
the listener will accept.
If you're meeting a friend for lunch, then you're
sure that they will agree to eat with you. So you can say:
In situations where you're not
sure how the listener will respond to your suggestion, you can use other
phrases like "Would you like to ___?", "Why don't we ___?"
or "We should ___":
Would you like to go out to dinner with me some time?
Why don't we meet at 7:30?
We should get together some time and have a drink.
To "go for a stroll"
means to walk somewhere in a slow, relaxed way for enjoyment. People usually
"go for a stroll" in a park, around their neighborhood, on the beach,
etc. Use it like this:
It was a really pretty afternoon, so we went for a
stroll and then sat at an outdoor café for an hour or two.