When you've got beauty like this 10 minutes away and kiddos under 5, they don't see any difference. Give Merry plenty of rocks and a body of water to throw them in and he's the happiest boy in the world. And Pippin? Mama's there and big brother is doing something interesting, he's good.
The boys are happy, the scenery is lovely and those big fancy national parks aren't going anywhere. At least, they'd better not be going anywhere. Any imminent mega-tsunamis or volcanic explosions can just wait another decade or so, ok?