Hehe, tag is more fun with more people, and it's pretty hard when you're not on the roads as you get more lag, and the dust trails make it hard to get out of sight, and there's not much grip on the gravel in H mode.
There's the old thread for it anyway:
http://forum.eu.atari.com/showthread.php?p=2064736
Shame I didn't film more of my escapades, but I can tell you about them:
Race Around the Island
MP Race Tournament
Canonball Race (list of points to race to was here).
Scavanger Hunt
NFS III Style Hot Pursuit Race
"Where's that suburb" + "Gumball Rally" + "Cops n Robbers"
Gumball Rally 2.0
Hide 'n' Seek - Hunter game
Ryzza's Rental Race
'Versus' Cruise
Dakar Rally
TDU Tag (as above)
I also once made a car picker tool for cruises where cars are assigned randomly
http://forum.eu.atari.com/showthread.php?t=87544