can anyone telk me how far it is? any taxis available?
I think you may mean the place at Lochgoilhead, which is further away than Ardgartan. There is a very limited bus service (the 302) which goes from Arrochar to Lochgoilhead. See http://web.onetel.com/~andypreece/timetables/gar302.pdf. also http://www.garelochheadcoaches.co.uk/resources/302+timetable..pdf
As you see, the times are not exactly the same, so you need to phone Garelochhead Coaches and find out which one is the more up to date!