I don't know what to wear for this?

Here's my photostream for a better idea of stuff that may or may not look good on me, I don't honestly know:

http://www.flickr.com/photos/38730453@N07/

It's like a casual meet-up with a friend-I'd-like-to-date. We don't see each other that often, so I'd like it to be good. We're just having a messabout at my house and going for a walk and just easy stuff because there isn't that much you can do around my town that's not cliché or that involves not getting yelled at by chavs. More to the point - I don't know what to wear, I know it'll be fairly casual but I want to wear something cute. Probably jeans but what kind of jeans?

I'm definitely wearing these trainers: http://www.office.co.uk/mens/nike/womens_mogan_mid...

because they're comfy and my style and I love them and they're good for walking. Any sort of outfit that matches those or looks good with them? Also, curly or straight hair, and any other tips would be really welcome :) thank you!