Hi,
In the valentines group there is not a link to sort by rating or hits so here are the links.
Basically you just have to add something to the end of the url.
For Hits
?show=instructables&sort=HITS_TOTAL&limit=500&offset=
For Ratings
?show=instructables&sort=RATING&limit=500&offset=

Here are the links.
Hits
Ratings

There you go. I guess you could add this to any group and sort by Hits of Ratings.
Thanks
Joe