Bubble lawnmower rocks for when he’s old enough to push without just face planting (not sure if C is there yet, I don’t think E was yet). He would probably still think it’s awesome if you helped walk with him. Regular bubbles is fun too though I’m admittedly horrible at it. Kiddy pool in the yard with little toys like rubber ducks, a dispersed sprinkler/hose head so he can play in the “rain”, light bouncy ball. We never had a water table but I wish I had gotten one. I wouldn’t want to clean up the mess but you live the beach life, maybe kiddy pool with sand and sand toys? Just sitting outside on a blanket with toys and frozen or super cold snacks is nice too.