oh hell's ya, you can go thru arcadia, past brownsville and a good solid 50 miles up from there (assuming its been raining, can't be done during the dry season) it goes further than my tank goes, that's for sure, but we've launched from the 760 ramp (arcadia) and also from brownville road and headed north from there. thats where you find the twisties !!!!
when you get a chance, watch adambomb's video.
[video=youtube;QAK2MailmXU]http://www.youtube.com/watch?feature=player_detailpage&v=QAK2MailmXU[/video]
there's more but this is an idea of how far north they got... its not a "great" representation of the twisties, but its pretty dam good.