I agree. I like both coffee and tea but even for someone who isn't a fan of brown/green tea I suggest some sort of hibiscus. Maybe I am just obsessed with Tazo's Passion blend right now, but I think people who really aren't into tea will still like this. It is tart and lightly fruity + will often be mixed with something like lemongrass to give it a bit of herbaceousness and/or a touch of tropical flavor.

I'd also suggest Gen Mai Cha as something which is common enough to be in supermarkets or coffehouses but which is a bit different too due to the toasted rice flavor. If you end up in Starbucks, last I went there was a berry-hibiscus "cooler" or something which was decent as well.