Michelle, If you can't get out of Edinburgh, there is a Scotch shop on the Royal Mile called Cadenheads. Very nice tasting of several Single Malts. If you can get out, I highly recommend Aberlour, Speyside. Wonderful tour and a tasting that will knock your socks off, from pure spirits to 20 yr. We were able to fill our own bottle and number it in the registry. ( to be held for our 50th anniversary in the closet) Royal Lochnager near Balmoral Castle is worth a visit.(nice crystal glasses) My favorite is way up in Elgin. Cardu a small distillery and the only one started by a woman. You can buy Cardu in the US so don't pay the extreme prices. All the distilleries we visited were all different. On the coast Oban, very peaty. Highlands, milder.
Yes, we toured Scotland. 1400 miles and I don't think we bypassed any distilleries except for GlenLevit in the Highlands.
Do your homework and visit your local stores to see what can be purchased in the US and only bring home what you can't buy here. I think you are limited to 1 liter a piece, but we saw many on the plane with much more than that. There is a thread on RS regarding this matter.
The pubs will have a Scotch of the day.
Enjoy your trip. The Single Malts are all so different.