DKT70's HD Roads:
http://www.gta4-mods.com/misc/liberty-city-roads---gtxd-f29884

DKT70's HD Liberty City Park:
http://www.gta4-mods.com/misc/liberty-city-park-f29957

Bison Sale's HD Tree'S:
http://www.icelaglace.com/mods/gtaiv/ice30/vegtex/