Qinguang Gong is a really nice Daoist temple, and there is an art/antique market close by which is worth a visit.
Have lunch inside Wenshu Temple. Vegetarian food made to look and taste like meat. Delicious.
The peak and temples on Emei mountain are fantastic. You can combine it with Leshan to make a 3 day trip.
I found Dujiangyan a bit boring, but you can combine it with a trip to Qingcheng mountain.
Some of the best trips I have been on are out west in to Tibetan areas around Kangding. Might still be a bit cold in April.