My husband and I both raced Ironman Tremblant just 12 days after Ultraman Canada in 2012... you just basically keep your post UM training light... swims, spin on the bike, nothing too long... and light runs. We were surprised at how well we did in Tremblant with such a short time between events. We then went on to race in the Ultraman World Championships that same year, and had raced IM Lanza in May as well, so it was a big year for us... you have to listen to your body - first and foremost, eat well, and be sure to get lots of sleep. It's amazing how quickly we can recover! I would say GO FOR IT... Ultraman Canada is one of my all-time favorite race courses - just stunning from start to finish, and Steve Brown and the event crew are the best!
5x Ultraman Finisher
18X Ironman Finisher
2013 Ironman World Championship Finisher
2012 Canadian Ultra Distance Female Triathlete of the Year
http://www.endurancetriathletes.com