My favorite places after 5 years of touring are the following:
Northern Argentina-Northern Chile-Southern Bolivia: all year around, but cold at night.
Southern Argentina and Soutern Chile: November to March
Colombia: All year around
Middle East: All year around, but autumn and spring probably best.
New Zealand: less adventurous, but beautiful in Febr-March.
Closer to your home, Florida is nice in March, Blue Ridge Parkway a bit later in the year.