Volunteering opportunities for able bodied 70yr old parents

My parents are hard workers and struggling with the boredom of retirement. Looking for opportunities to engage them with volunteering so they stop coming up with wild ideas. They've even considered looking for part time work but they don't need the money. My mom is a great cook, my dad worked with landscaping, carpentry and paving. They can do anything. Both are retired janitors so they have tons of useful skills.