I did a bunch of flying at Renton and BFI(Boeing Field) on layovers....there is a nice Mooney available at BFI if you are interested.
If you are not extremely familiar with the airspace around BFI, I would strongly suggest not flying around VFR. The Seattle class B airspace goes down to the ground a short distance to the south and starts at 1100 feet overhead the southern half of the airport with the SEA-TAC arrivals flying fairly low overhead. Even the VFR departure routes are complicated at first sight and there are lots of problems that someone in a fast aircraft can create in all directions if they don't know what they are doing. The airport is in a valley and one flies very close to the houses on the overlooking the airport when departing east or west.
You have to know what you are doing.