Hwy 25 to 380 to Carrizozo (check out the Valley of Fire just west of Carrizozo) to Capitan - pick up 70 to Roswell.
Hwy 70 is also okay. Most all are two lane but good roads.
Also try Hwy 249 out of Capitan into Roswell - nice drive
Lots of open country through here so watch fuel -
Up 54 a few miles North of Carizozo on 349 is White Oaks and the "No Scum Allowed Saloon" - interesting visit -
Billy the Kid Country. Historic White Oaks, Lincoln County, New Mexico brought to you by the White Oaks Arts Council.
That whole valley up 54 has interesting stuff -
Roswell has the Alien Museum - good for at least one visit - Eat at Cattlemans in Roswell.
Not much on 70 north out of Roswell