The Trail Foundation's vision for an improved Hike-and-Bike Trail entrance -- or trailhead, using the preferred hiker-and-biker parlance -- in downtown Austin's rapidly-growing Rainey Street District is finally taking shape this month. At a public engagement meeting held last weekend, the nonprofit showed off two possible design configurations of an upgraded entry point and park space surrounding the trail at the parkland located on the corner of Cummings Street . . .