Fun! Here are a couple of ideas:

LED Lantern w/ USB Charger

The Lantern doubles as a USB charger, spotlights have remote controls and can be mounted in trees, etc. My favorite feature of the spotlights?? Motion sensor. If any animal is lurking around your campsite, they'll come on. (Note: These are battery powered, not solar, but should give you about 30 hours with each new set of batteries)

Solar lights are another option, but typically don't give you as much brightness, especially if you have a rainy day, or your campsite has a lot of tree covering. You really want a solid day of bright sunlight for a full charge. That being said, here's some solar spotlights that might work: http://www.pegasuslighting.com/solar-led-spot-lights-remote-panel-2-pack.html.

Hope that helps! Enjoy your trip!