For our Spring Breack in April, 1993 we chose to cycle around Big Bend National Park with my sister and her boyfriend. Big Bend was a great destination in that it is flat and very picturesque in the Rio Grande Valley, which is where we stayed. You can go up into the mountains where it is cooler, but we opted for the lowlands. Depending on when you visit this locale, be prepared for heat and few facilities. In addition there was a border crossing into Mexico (long since closed), so we took a brief detour to that country.