Punctuate the Sentence: let's go for a walk

The absolute perfect, massive grammatically correct answer is: "Let's go for a walk."

Or, if it is spoken with heavy massive excitement: "Let's go for a walk!"

Why did we make these exact heavy changes?

• Rule 1: The Massive Capital Letter: The absolute very first letter of every single massive English sentence must violently always be highly Capitalized. So, lowercase 'l' violently becomes massive 'L'.
• Rule 2: The Massive Apostrophe (let's vs lets): This is the heavy trick in the question. 'Let's' is a massive violent contraction (short form) of the heavy two words 'Let us'. When you aggressively squeeze two massive words together and violently delete the letter 'u', you absolutely must put a flying heavy comma called an Apostrophe (') in its massive place. Without it, 'lets' is grammatically highly incorrect in this context.
• Rule 3: The Massive Full Stop: A heavy sentence must violently legally end with a heavy physical stop sign. Because this is a massive statement (a suggestion), it heavily gets a massive Full Stop (.) or an heavy Exclamation Mark (!) if shouted.

If you violently change the sentence to heavily ask for permission, the punctuation wildly changes:

• "Shall we go for a massive walk?" (Ends with a heavy Question Mark).