Remember SafeGuide - kids need to be wearing helmets. We also had a Guide helper with us, who led us in a fun game of follow the leader with the bikes. For the girls, I asked that they bring something wheeled. Skateboard, Rollerblades, Scooter, Bike, Trike etc.
So we got there first, and had all the girls show us how well they can put on their own helmet. We demonstrated (with our Guide helper) how to properly put one on, and made sure everyone's helmets were on properly. Then we looked at other safety equipment. Knee and elbow pads, some people have mouth guards, some brought padded gloves in case they fell on their hands.
When we were finished, we looked at how to keep our bikes/trikes etc in tip-top condition. Rubbing them down if they were wet, oiling chains, pumping up the tires and all.
We then played follow the leader on the bikes, in a line, with the Guide leading around the parking lot. They were to practice their hand signals as they went.
Then we had about a half hour of free time. I had a bunch of bubble wands, some sidewalk chalk, and, of course, we had the bikes to play with.