Here are some productive things to do this summer for when you're bored :)
Workout videos (Recommend the Chloe Ting ab workout)
Bake!
Do chalk outside
Draw/paint
Read classic literature (or any books really)
Take online courses (language, computer programming...)
Try yoga
Go on walks/run
Try something new (longboarding!)
Watch a documentary (There are some great ones on Netflix)
Clean!
Do a puzzle (puzzles, wordsearch,crossword)
Play trivia with your friends :)
Visit a museum
Try an educational podcast