Any suitable Summer activities for a kindergarten kid?

Bring him in a farm where he can feed animals, plant and harvest veggies or fruits. I brought my daughter in a zoo in Tagaytay she enjoyed feeding the animals there. 2 weeks ago, we were in La Trinidad where she harvested strawberries and lettuce. She enjoyed that a lot!

"Kidpreneur" po. Set-up ka po ng mini store nya sa harap ng bahay mo. Pwedeng palamig or ice candy ang mga paninda nya. Tapos yung kikitain nya ay i-deposito nyo po sa banko under sa pangalan nya. Para bata pa lang ay matuto ng mag control at pahalagahan ang pera.

Enroll him in a Taekwondo or Art Class. Or in a mini manager class at Jollibee, McDonald's or Friday's.

How about sports? Ready Steady Go Kids has a good program for toddlers to 6-7 years old :)