1. Probably sloppy, it rained a LOT, and these aren't rock armoured well draining bike park trails. I wouldn't do it but I live here and do it several times a year. I would give it a miss until things dry IMO, there's other stuff that will be way better in these conditions.
2. Best combo is the new trail middle of nowhere (starts near the end of kyber on the right) to Kashmir to Kush to bc's
Second best combo is kyber to Babylon to see colours and puke to highside to high line to business time.
3. Last time I did combo 1 I went up peak chair at like 11:30 and was in creekside like 3ish at a very slow pace riding with several people doing all of it for the first time. Combo 2 longer.
I will do a shameless plug, I do coaching/guiding for the park and it is possible to grab a guide for these routes, last time I did it with my DFX group and nearly every other group of people was asking me for directions and asking about the next sections and what route to go and stuff. I suppose these things happen because it will get more popular but some of these people seemed really clueless and in over their heads.
But most of these people were from far away, if you are good with black+double black (by sea to Sky standards) you'll be fine and have a blast… Once it's drier.