An important hair dilemma.

I am in my sister-in-law's wedding on Friday, and I'm wearing this dress at this venue (outdoors):

And these pumps (please cross your fingers that I don't fall and break my ankle - I don't want to be that bridesmaid who fell down the stairs because of the matching shoes):

And I have this hair, which is ridiculously thick (put your index finger on the tip of your thumb and that's my ponytail) and doesn't like to stay in an updo:

I have to decide on a hairstyle, and don't know what I should do with it.  I hate styles like this that look too perfect (no offense if this is your style, it just looks bad on me):

So, I'm thinking something similar to these options:

What do you think?  Please leave me a comment and help me decide!