NASA provides STEM internship opportunities (https://intern.nasa.gov) to K-12 students above 16 years old. The program offers the following options:
Oracle Academy collaborates with organizations in nearly 100 countries to support thousands of educational institutions and millions of students each year. There are many useful resource and award to secondary students.
This is one of Texas's largest regional science fair competition for student from 3rd grade to 12th grade. Students who win at their local schools and the top winners from the middle and high school division can join the Texas Science and Engineering Fair. The six "Best of Fair" project from high school division will advance directly to the Intel International Science and Engineering Fair. Each year it has different theme.
Registration deadline is normally in early February. However, the date might be different from year to year. Please check in September to prepare the participation. Please check http://www.sciencefest.org for more information.
Austin Parks and Recreation's Summer Camp
Registration starts March every year, the summer programs are for children 5-12 years old, and some facilities provide preschool and teen programs in the area of active play, outdoor adventure, strategic games, or cultural activities.