I personally would NOT get the Trailblazer passes. SDC is just like any other park, a little planning and getting there early will set the tone of your day.
Here is what we do.....
Get to park an hour early and eat breakfast or grab a cinnamon roll, hang out at the chain drop, go down Hill street, hit Outlaw Run, Wildfire, and Powder Keg (I like that order, but prolly doesn't matter), at this point start hitting whatever other rides top your list (Barn swing, Thunderation, Lost River, American Plunge, Flooded Mine, and the train top our lists), being April you can prolly save the water rides after everything else. 75% of the time we have all our top rides done by noon to 1pm and then have a nice lunch and have the rest of the day to hit shows/demonstrations or some of the less popular rides.
I'd try this first and then make the call on the second day. I bet the second day you again won't need to buy them and just use day 2 to reride favorites. April is generally pretty easy.
Good Luck! Let us know how it works out for you!