Flopping a small set from the BB , how do you play them?

This happens to me every once in awhile. I'm in the BB with a hand like 22-77 and a few callers (say 3 or 4) limp in and I check. Flop brings something like J/9/x where x = my set cards and double suited.

What's the best play? Lately I've been betting almost the pot, but have been taking it down right there more often than not. Checking seems far to risky with straight or flush draws out there (or both). In an uncoordinated board or a board with an Ace on it checking probably is safer because everyone loves limping with ace rag.