Be a courteous skater — always be aware of other skaters and follow the traffic flow of the rink. Be careful not to get too close to other skaters with your exposed blades. And keep your skate laces tied tightly so that you don't trip yourself or anyone else up.
If you feel yourself beginning to fall, bring your hands, arms, and head into your body to absorb the shock of hitting the ice. And make sure you hop up quickly so that you are not in the way of other skaters.
Skating can be hard work, and puts a lot of stress on your leg and back muscles, so be sure to warm up before you skate and stretch those muscles well.