I like the Take Care clinic here for when you know what's wrong and need it fixed ASAP like a sinus infection, UTI, Strep throat, etc. It is a lot like Quick Care, but much faster, nicer nurse practitioners, cheaper, and cleaner. You can even look on their website to check the wait time before heading over. You can make an appointment too, but they fill up quickly because they are so few appointments each day. It is very much aimed at the walk-in crowd.
It is also nice if you need a prescription since you are already at Walgreens, so it is once less stop for you on your way home. Super nice when you or your kid is sick.