Seconded about the route and organisation - both are excellent. Last year's ride had excellent weather too.
Just a quick note about a tandem on the SITD route, there is one footbridge with some nasty steps that could be tricky with a tandem. LITA is a gentler route, but not quite as picturesque as Sprint into the Dales. Both routes have very generous time limits so getting round in time is not usually horrendous.
There's a Tandem Club social 30 miles from Ilkley to Embsay, which is aimed at families so I may be doing that instead with my daughter. If the contours do not appeal I am sure the Wows would be made most welcome on that ride if family duties permitted.