Guam Local transportation
Guam is a fairly small island at 212 sq miles. You would be able to drive from one side to the other in about 1 hour 30 minutes. Getting around the main part of Guam Tumon Bay is pretty easy. Just hop on the red shuttle bus at one of the many locations around for $3 for a round trip or they have unlimited rides in a week options also. You would also have the direct options of a taxi or Uber ride. If you are trying to get out of town, your best bet is to rent a car.
You can grab a rental car for about $45/day or $320/week that includes the damage waiver insurance. So you can drive it like a rental…. lol. We would highly suggest at least having the rental car for 3 days to experience more of what the island has to offer.