Lunch at Casa Rio on the River Walk is always good for watching tourists boating down the river (est. 1947).
Dinner at 'The Little Red Barn' on South Hackberry if you are a meat eater. Go for the largest T-Bone. It has been there since the 50's and the waitresses wear pistols.
Texas Transportation Museum, 11731 Wetmore Rd. 210-490-3554
Real trains, Garden RR layout and other transportation items.