Altamont is in the process of being repaved. If that's done by the time you ride it it should be really nice. The favorable winds make any of the 3 choices (Altamont, Patterson, Tesla/Corral Hollow) pretty nice. From Tracy you can take Linne to Kasson to 132. I've ridden Linne and Kasson; they are not bad. Don't know about the traffic on 132 into Modesto.