Ah shet, I forgot to make one more edit to the suggestion. In regards to LS, this is rather a bit important since NorthWest-North regions are unrealistically restricted. I'd like to correct that as well, and also open up new viable routes to the northern regions.
LS Border suggestion
V2These solve the primary problems found as already marked in red region. The Richman areas are opened up. And all of the LS Vinewood region is accessible.
The Main LS Highway is opened up fully without a absurd pause and one can use that opened up region to flank from the right to the upper hills.
Similarly the western regions have been opened up to suit the water gameplay convenience. Should a president be stranded there, he can climb up to the FC regions, which has decent cover, and vehicles to make escape from and it also has a working petrol pump to spice things up. And with this the tunnels can be accessed from both sides. And can make a full loop with the FC Highways that connect into the LS-FC Bridge.
The Northwestern region corner has been expanded to reach a shore where the player can use to climb up to the Upper Hills of LS. I have made sure it doesn't leak into Blueberry and Red County Mainland too much.
Overall this sorta fully opens up the map and most part of Lost Santos accessible and fully explorable routes, which also is convenient to ground and boats.
Although it has more polygonal maps than the usual I suggest. But I believe this is good and will make LS feel more LS.
As for LV, at the time I forgot to make any suggestions for it.
Here, I'd like to open up the borders fully a bit so that Boats can actually make a comfortable travel rather than getting sandwiched terribly. As of right now the borders are too close to mainland and favour president getting squashed between border and areas that cannot be scaled and dying due to Water Timer.
The Southern Borders leak into the Northern Borders of LS a bit so people can climb up and escape into either the highways or the railway route. Alternatively this can be used to ambush Boats.
The Blue borders is just a extra suggestion to open up the mines. It doesn't get explored in WV and NSA due to Area69 and Ships. So this area gets left behind, while it has good potential in GM considering the various ramps, levels and covers and what not.