Don't want people to get comfortable or scared when it comes to cheating, but every now and then I virtually hit Santa Monica and just park there. Depending on where you're spoofing from if you're going to choose Santa Monica you're 100% going to be softbans on arrival if you're last logged in location isn't anywhere near Santa Monica. From my experience softbans aren't anywhere near 4 hours long. Atleast they haven't been for me. I've checked back as soon as 45-60 minutes and am able to play again in the spoofed location. So my suggestion is if you're going to spoof there stay there until the softban goes away. Seems to me that if you stay long enough you can find a decent amount of rare mons if you pay attention to pokevision. Lots of locations can be spoofed to within Santa Monica without getting soft banned again. If you're ready To go back to where you were originally or you just want play with your current location cause you'll be out and about be prepared for another soft ban which again I haven't experienced anything longer than an hour.
You will only get soft banned using the walking around tweak if you travel a significant distance. Other than that you can walk around as much as you like withing your immediate/semi immediate area.