I was stationed aboard a ship home ported in Guam twenty years ago while in the Navy. It's where I rediscovered bicycling. Hornet Bicycles is a world class bicycle store/shop. Guam is a beautiful tropical island. Which means warm, 80 degrees, humid 80percent, occasional rain showers daily. Rain gear is not necessary. The rain is warm. If your not wet from the rain you will be from sweating. When it does rain the roads are extremely slick. They don't have gravel, so coral gets mixed in with the asphalt. When wet it becomes slimy slippery. it's a small island, you can cover all the roads in one day. The warm, humid, marine environment is very corrosive. The trick I learned from the locals is once a week wash your bicycle with wd40. As I said it' s a beautiful island you can find white sand beaches with no one on them. As they in Guam: summer never ends.