Beach – Take a garden spade to build monster sand castles, none of this fannying about with little plastic things.
The yacht club seem to be running courses for young kids at the moment, loads of littlies out on Toppers
Crabbing off the jeti
Walk up the Roman Road (follows the rock along the coast, starts at the end of the gardens / park by the Penhelig Arms Hotel)
There’s a half decent park for kids
Walk up the big hill at the top of Copper Street
Climb Cadair Idris (just done this with my (just turned) 8yo daughter)
King Arthur’s Cave thing at Corris
Eat ice cream
Go to the beach again
Coed y Brenin is not too far and has tame routes.
Cycle the Mawdach trail into Barmouth for ice cream. (very flat)
Go see the Dyfi Osprey Project
The Red Kite feeding at Nant y Arian is pretty spectacular
Climb up to the BandStand (it’s crappy but my kids like doing it)
Oh and Donkeys, but it’s a bit short ride and expensive but they are well looked after