Must visit (for easy, practically free points): 3, 6, 11, 33, 43, 55, 72/72.2, and 92
Recommended (but you'll lose a couple lives): 62, 64
Worth it if you're feeling lucky: 15/15.11, 25, 51
My routine is: 3, 6, 11, 15, 25 (if I have

), 33, 43, 51, 55, 62, 72/72.2, and 92. It's gotten me over 4 million points a couple of times now, without even earning many big crystals along the way. Even if you exclude the hair-pullers (15 and 51), you should still be able to pass 3 million easily.

Most recent Good Things for me:
I won NaNoWriMo!

Also, I had a fairly decent game yesterday:
2: Just as I was thinking, "Man, on the French server, a Golded Mushroom appeared here..."
2nd Book of Mushrooms. XD
7:

10:

17:

22: 4th Chocolate-Dipped Cream Puffs
28: 4th Red Delight Mushroom
33:

XD
33.2: NOOOOO #$^&#$698#$&^ AAARGH. (I feel like an idiot. Couldn't even get the cane before falling on the spikes.)

51.6: 9th Armor of the Night
54: 10th

72.2.2:

72.4: Two giant crystals.

96: Perfect slam! (Costs a life, but satisfying enough to be worth it.)

Incidentally, what would cause bombinos to be stunned (but not start flashing) when the only thing you've done is spam white bombs at them? They don't stun each other when they explode, do they? It's happened a couple of times now in PD33, when I've attacked several in a group. Kinda puzzling.