FOLLOW-UP:
For space reasons, I dropped the reference to the Dallas Zoo - it is NOT walking distance (unless your definition of such is incredibly generous), but there is public transportation from downtown - a train, with a station at the zoo entrance. Award winning facility; I'll forgive them for simply assuming I was eligible for the Senior Discount without asking.

The Dallas Mavericks have clinched a spot in the NBA playoffs, although their opponent and schedule are not yet set. The NBA's web site says that the playoffs will start on April 18th.

I am still researching just how to get to Arlington for the Rangers game. It is DEFINITELY not within walking distance!