Scaleburn Vein in Rampgill is mostly a stroll, only one crawly dig before the Whim Chamber and four after; air quality drops off markedly after new dig beyond the the Whim Chamber, but still an interesting trip at that. Some freeclimbing into flats and stopes if desired, otherwise all on the level. Welly deep or less.
Rampgill Vein is substantially wetter and crawlier, a good workout through the 15 or so Norpex digs but no water deeper than occasional knee deep. Lots of free-climbables. Plenty of interest along there, worth the trek. Takes a good hour to reach Boundary Gate from the portal without any sightseeing!
Hangingshaws is a pretty easy walk and mostly ankle deep, but one dig ways inbye ponds up the water to thigh deep, before reaching the ladder into Prouds flat, which is worth a look.
There are several recent videos on You Tube (varying degrees of muppetry) I'd recommend watching anything by Paul Marvin (Patterdale Rescue) as he tends to do straightforward, accessible interesting places without deep water or difficult terrain.
MARK