All year long, The path doesn't actually close, but the gates going into Metro Beach do. The summer is great, being near the shore helps keep temps down a little. Temps are usually in the high 70's & 80's. Wear bright breathable clothing, bring water, and any food or supplies you might need. Mark actually managed to get 2 flat tires on the path and only had 1 spare tube. So remember to bring tubes, tools, and a pump as well. And as Dr. Lisa always says "Wear Sunscreen".
The park at Metro beach has toilet rooms, water, and vending machines available. Since the path follows Metro Parkway road, you are never too far from civilization. You will be able to find fast food, and party stores readily available for the majority of the path. The shopping center at Crocker is a good place to park and start from.
There are a large number of enthusiast using these paved paths, from joggers, walker, bikers, inline skaters. All these groups need to be considerate to the other, these paths are designed with "Multi-use" in mind. Remember to keep you speed in check, don't spook other trail users or wildlife, and pay attention to your surroundings. As enthusiasts we should all share the burden and use the paths sensibly. Stay in control, and on the beaten path (avoid short cuts), do not to destroy any vegetation, and always throw trash in the garbage cans.