Fill in the blank with an appropriate question tag:

Let's go to the beach, ________?

Shall we?

The correct answer is Option (4) - Shall we?

• In sentences starting with "Let's", the appropriate question tag is "shall we?" to suggest or confirm a proposal or idea.
• Other options like "can we?", "should we?", and "can't we?" do not match the typical structure for such sentences.
• Let's go to the beach, shall we?