Hide plenty of glow sticks over a wide wooded area. Each team has a GPS with pre-set locations of where their coloured glow sticks are hidden. They have a given amount of time to find said glow sticks and return them to base.
As a bonus, if they find another team’s glow sticks they collect them also and bonus points are given.
Just hide the glowsticks over a smaller area and give a suitable amount of time to recover as many as possible.
As an extra challenge flour bombs, offering minus points, also work well.