I would eschew grabbing a model kit over slipping through the portal myself and going for a drive, just to visit the many places that used to sell model kits. I'd just peruse the stuff on the shelves, to refresh the memories of my childhood.
Did I remember correctly? The Hobby Company had paint racks that were well stocked with Pactra Authentic International Colors, my most favorite paint line ever.
Pete's Modelcraft was our main hobby shop in the 1970s, with stores in several major shopping centers. As a kid, I didn't pay attention to a lot of their kits, as I only focused on what I could afford. What DID they sell? That would be an interesting question to answer.
The Woolworth's chain here in Hawaii had a great buyer when it came to model kits. They had a wide selection, from cars to planes, ships, and sci-fi. I don't recall them carrying a lot of armor though. I bought my first MaK kit from the Ala Moana Woolworth's in 1985.
The Legionairre was a wargaming shop that carried a lot of armor and cool aircraft kits. I bought my first Tamiya tank there, an M60A1, for a whopping $10.50. That was serious money for a kid in 1977.
Even the drug stores had decent model kits. Longs Drugs was the first place I saw the Monogram B-17G in 1975. I think it was going for $8.50. Too rich for my blood, but my friend's mom got him one, so I got to see him build it. The Shep Paine diorama sheet in the kit blew us away.
But what I would really like to do is go to my favorite eating places that have disappeared. Chico's Pizza on Waialae Ave for their Ono's Special pizza plus a bucket of their pressure fried chicken and potato wedges. I'd sit in their dark dining room, on a park bench which passed for furniture, enjoying the chicken while waiting for the pizza, all the while marvelling at the steady stream of cockroaches travelling up and down the heavy blackout cutains. 
Byron II steakhouse at the Ala Moana Shopping Center for a London broil, followed by a cherries jubilee for dessert. No cockroaches behind the curtains though; this was a classy joint.
The Yum-Yum Tree at Kahala Mall for a mushroom burger and a slice of their pecan pie.
And if I had some Immodium handy, the Harvest House in Woolworth's. I'd have their club sandwich. Or if I was feeling like a gambling man (thus the Immodium), their broasted chichen.
And maybe grab a strawberry/vanilla Icee or a Green River drink from the fountain at Kress.
Yes, I have obviously given much thought about this before. You can still get old kits if you want them badly enough, but I cherish the memories of "being there" even more.