I suspect that the reason this got no feedback is that it's a bit tough to hit all the requested items together. The southern-most 700 miles or so are about all I'd be inclined to try in the first part of May, though maybe parts of northern CA would work fine then (? dunno). Even in the first 700 miles, depending on snow year, some places such as Fuller Ridge, Mt. Baden-Powell etc might be dicey.
The problem is that in those first 700 miles there are precious few "streams and lakes" to fish in. Apart from the artificial canal at one point, the first real well-flowing water I recall seeing was heading in towards Kennedy Meadows. Amazing how wonderful it was to see that after 700 miles of taking care in mostly quite dry country between water sources.
And I have no idea where greyhound stations are; I think this is something you'll need to look up yourself in the context of where the PCT shows up on some map that might also show such data. Google Earth, perhaps, or something like that. But hitch-hiking can eventually get you to a bus regardless of where you get off trail.