Reply to "take a walk"

kuen posted:
If they're not already in the water lying on their surfboards yet and still sitting on the beach, in this context, can I say

1. Let's go surfing or

2. Let's go and surf or

3. Let's go surf or

4. Let's go for a swim or

5. Let's surf.

Hi, Kuen: Have these people sitting on the sand come to the beach with the intention of surfing, or does the speaker mean to suggest something that they hadn't thought of doing already? When you can answer that question, tell me what you think the answer to your question is.

P.S. In English, sentences end with a period. They never end with "or."