Wildflower double?? You ROCK!!!
I did the sprint at Wildflower in '04....was an amazing weekend. I drove up from Santa Monica/West LA area...I think it took about 3-4 hours.
Definitely get there a few days early, and enjoy the long weekend and the whole experience w/ thousands and thousands of new closest friends....
The swim's in Lake San Antonio...as for the bike and run...hills. I think its part of the rules that you need a mtn bike for the bike portion. The bike seemed like one big hill-2 loops. The run has several rolling hills--not bad-its out and back, 2 miles. The year I did it- was HOT--the year before, it rained (poured) and course was really muddy.
Definitely a good idea to throw hills into your training. Being a newbie...the sprint was fun and a challenge..and a little different being on a mtn bike in a tri---For me, the 'other' best part was hanging out and watching Olympic and long course races (those courses make my sprint hills look like bumps in the road).....strange (motivating) things happen when you hang around that crowd...at the time I remember thinking I'd never be able to do more than the sprint...next year I have plans for the Olympic.
I just got back into tri's last year, and completed 5 (4 in So. CA, one after the TI Camp in Killington, VT, and Wildflower was BY FAR the best and most fun experience. Perhaps more than you needed to know...couldnt help myself!