The City of Seattle offers tennis lessons for kids and adults (private and group lessons) as well as court rentals. The facility is convenient and has free parking. They have 10 indoor and 4 outdoor courts. The lessons are great - I took a beginner adult lesson with 4 other people and learned a ton. Their instructors are wonderful and the facility is very nice. Rates are very reasonable ($45/hr for private or $65 for a 6-week group course).
There is a lottery to get into the lessons, but I had no problem getting the lesson I wanted.
more