Need some advice guys!

This will be short and sweet. I have been invited to a pool party (Men Only) tomorrow at Rehoboth beach DE tomorrow into Wednesday. My long time friend that I re connected with on facebook is gay and knows about my bisexual side. He assures me I will have a great time and it will "Open my eyes" to the real gay community. My wife thinks I have been invited to an overnight tuna trip out of Ocean City MD so I do have a cover story.
Here is my problem. I DONT KNOW WHAT TO EXPECT. I am so excited I am getting butterflies in my tummy every time I think about it. I am excited but scared. My friend said it would be freeing and fun. I feel like a women wondering what to wear and act in this new environment. My friend says I should wear low rise bikini swim suits but I think I should just wear board shorts and see what happens. I feel really self aware that I am not a super slim guy that can strut around in a low rise bikini (even though I do feel sexy).
So should I go AND which suit should I wear. Now I have shaved and have a decent tan since the pictures were taken so its not as bad as it looks. What should I do? Attached are pics of my body. PLEASE BE HONEST!

http://xhamster.com/photos/view/4011540-67576168.html

http://xhamster.com/photos/view/4011540-67574498.html