1.这两者区别不大,都有“去做某事”的意思.
2.不过,go doing中的do一般都要求是不及物动词,如go shopping/swimming/walking等.
而go to do sth中的do无此要求,且有时可以转化成go and do sth.
如：Let me go to look at it.= Let me go and have a look at it.