Wide angle lens ?

[mox]

I recently got a Nikon Coolpix 5700 and I'm thinking getting a wide angle lens next week. I saw a lot of pictures with these lens and I really like the effect it creates

I saw that Nikon makes a wide angle (78 degrees) for the 5700 (requiring the adaptor)

Is there larger angle wide angle lens that wold fit my camera ?
I got the Nikon UR-E8 lens adapter from ebay.. can I put something else than "made for the 5700/8700" lens on that ?

I'd really like to get a wide angle lens that do ~90-100 degrees.. does that exist ?

Anyone can show me some pictures taken with/without the wide angle and the angle of the wide angle lens used ?

thanks