We attended the "River of Lights," Holiday Light Show at the BioPark (Central Ave @ New York Ave.) last night, and enjoyed every minute of the approximately 1/2 mile, 40 minute stroll, and million-plus lights, in creations varying from hummingbirds, to a T-Rex. Certainly worth the $7 for adults, and $3 for children entrance fees.
Tip: Arrive early! Ticket sales open at 5:30pm, and the gate at 6:00pm. You'd be amazed how many people are arriving just 30 minutes later! Better yet, enjoy the adjacent Aquarium, and it's restaurant /gift shop before the River of Lights. The River of Lights continues nightly through Dec. 30th, but is closed on the 24th & 25th.
Dress warmly! It is cold alongside the Rio Grande!