If july I introduce you to Kanchanaburi is a natural feel, there are waterfalls, rafting excursion mountain. Natural cover areas not far enough in Bangkok, about 2 hours.
If july me introduce you to a trip to Kanchanaburi feel Rafting, waterfalls, mountains, nature, covering many areas. It is not far to Bangkok Driving about 2 hours
If July I suggest you go, Kanchanaburi, will be out feel nature, rafting, waterfalls, mountains, natural cover area, and not far in Bangkok. Drive around 2 hours.