Hah, I was thinking the same thing, but didn't want to rain on anybodies parade. Just the big font, the small is OK. T-shirts can be hard to read anyway, with peeps moving around, contours and what not. Background and riders are great!
Of those options, I like the OE because of the readability. I like the first one for the overall look, but again, it's a little hard to read the "jetski" part (just because of how the "J" and "T" look, and since that's the most important part, I have to vote for the other font.
Maybe you could find a similar font that's a smidge easier to read (I like it in the small letters, it just happens to not be as readable on that single word) that would still kind of go with the small font.