You will have fun on that airport project. Will it ever end?
Welcome in advance to Oman. Plenty of dirt roads, wadis, and other places to go and wallow in the sand and gravel, if tht is your preference. A fair choice of regular roads as well. When you get a bike, post here again or send a PM, and I can make some suggestions for rides to get you going. Or just find As Sifah on google maps, and try to figure out how to get there from Muscat. All of the routes are good!