Hi I am looking for some road races similar to USAC Cat 5 level. Either one day races or criterium races would be great. Is there anything like that here in Thailand? If anyone know about this type of thing please let me know. Thanks.

There few crits in Thailand but plenty of road races. Unfortunately many of them are "MTB on Road." They don't use a category 1-5 system like USA Cycling. There is "Open" and age graded races, starting at 30+. Some of the races have an A and B category for the age groups. The B races are more like Cat 6.

Some are listed here -- http://bicyclethailand.com/events/

Others are in ThaiMTB.com (Thai only)

If you're in the Chiang Mai area you can PM me and I'll put you on our list for local (northern Thailand) info.