In the Name of God, the Compassionate, the Merciful.
Hi!
Conversation
A: I really want to go to the beach this weekend.
B: That sounds like fun. What’s the weather going to be like?
A: I heard that it’s going to be warm this weekend.
1- What does “fun” mean here?
2- What does “That sounds like fun” Mean?
3- Why “That sounds like fun” and not “That sounds fun”?
Thank you
1- What does “fun” mean here?
Enjoyable
2- What does “That sounds like fun” Mean?
“I think that what you said would be enjoyable.”
3- Why “That sounds like fun” and not “That sounds fun”?
Great question!
Practically, I think they are the same. You might be able to make a point that “That sounds like fun” is slightly less definite than “That sounds fun”, but I don’t think a listener would infer a difference. It’s all informal.
Thank you so much, Arinker 
Very nice.