If I may be blunt, I can't really say I find anything special about this platform. Now if you're hosting a New Years Eve party in the chat, I could get behind that. I don't really see how a theme park would really work. Seems to me it would be more RPGing than anything. You can't really experience things like that on a website.
Granted, you guys still have 3 days to convince the rest of the members. Coming from someone who has been to the mountain top, I recommend throwing something like Easter and general spring events out there. Ask the members what they want as well.