I'm local and ride there about twice a week.
The trail conditions are absolutely top notch at the moment with the good weather we've been having they're nearly dusty!!
There is only one diversion I belive and it's on the MBR and Beast trails, they're doing repairs on one piece of singletrack. If you were thinking of doing either of these trails don't let that put you off because the diversion actually takes you up a fireroad for a short while and then onto a very sweet descent, it's the last couple of sections of the Addams Family.
As for food there is the cafe on site which has good food, the lamb burger is recomended.
If you want pub grub about four miles up the road there is the Rhiw Goch inn situated near Trawsfynydd Holiday Park (follow signs for it) which does a fantastic Sunday Carvery and also does great food at any other time. Map: http://www.bing.com/maps/?FORM=Z9FD#JmNwPTUyLjg0NzQwMzI4Nzg4NzU3fi0zLjkwNzY5OTU4NDk2MDkzNzUmbHZsPTEyJnJ0cD1wb3MuNTIuODMwOTcyMDc1NDYyMzRfLTMuOTA3NDE5OTY0NjcxMTM1X0xMNDAlMjAySFlfX19lX35wb3MuNTIuODY5NjIyNzA3MzY2OTRfLTMuOTA4OTMwMDQ4MzQ2NTE5NV9MTDQxJTIwNFlCX19fZV8mbW9kZT1EJnJ0b3A9MH4wfjB+
Anything else just ask