Smallcleugh is the easiest though a fair walk up from the car park and is well visited but once off the tourist route to the Ballroom there are plenty of interesting places that don't have hundreds of pictures already posted here.
Rampgill is right off the car park but is over-welly wet for everything except Brewery shaft. Scaleburn would be the best target - try and get a different pic of the horse gin!
Brownley Hill is OK for dryness, at least as far as I can remember cos I've only been in once.
Capelcleugh and Nentsberry Haggs are muchly wet so best avoided.
I'm up most Sundays if you don't mind being guided by someone who gives a very good imitation of someone who can't quite remember where he is...
Don't look so embarrassed, it's a family trait...