WIP: Summer's coming

After being so much inspired by my Internship I'm doing with Kristina I thought I have to make a new iPhone Wallpaper :)

But I need you help!
1. Any Improvements on the pixel side here?
2. What summer activities can I include here? It should be something people do together when they're in a park.

Thank you very much in advance! I'm going to release it ASAP (At least before winter :p)