Fall River is fishing very well right now.  The fish are starting to spread out, which is nice.  There are still ridiculous concentrations of fish in some of the upper parts of the river, but they've seen a lot of flies already and are pretty wily.  Look for fish that have just moved into some of the runs downstream for easier fishing.  There is a good PMD hatch mid-day and there are plenty of dry fly opportunities if that's what you're looking for.  The nymphing and streamer fishing has been excellent.  Try small mayfly nymphs with no flash or bead.