Hey dublin2galway. Got any more specific questions, I'm not the best at the general sort!!
Best thing in the area, especially the claran area is the lake. Always nice to go boating/fishing or even just for a walk along the shore.
Ross Abbey is also well worth a visit when you arrive and it's a nice place to show friends and family around when they come to visit. Off the top of my head I'm not sure what else you'd like to know. There's both a gaa and soccer club in the area aswell as a recently reactivated musical society. There's also plenty of pubs if thats more your style. There's 2 chinese restaraunts and an indian restaraunt (yes it's strange in a town this size!).
http://www.headford.org/
As for down sides ... the commute to Galway at rush hour is a serious pain in the arse but nowhere near as bad as Dublin commutes. Recently we've had roadworks left right and centre aswell but thats just a necessary nuisance to upgrade the place.
Feel free to PM if you have any other questions.