How to say this is Japanese?

Question:

How does one say,
"This looks so cool! I would love to join"
In Japanese?

Answer:

よさそうですね! ぜひ参加したいです。
yosasou desune! zehi sanka shitai desu.　 <-- this is more like "sounds good! i'd love to join"


if you really want to metaphrase the word 'cool',

かっこよさそうですね！ ぜひ参加したいです。
kakkoyosasou desune! zehi sanka shitai desu.


hope this helps!