The Rivertown pre-school in Hastings is also good. Its full day and more of a daycare but they do teach the kids stuff they would learn in pre-school. You can drop your children off as early as 7:30 and leave them there until 6:30. It is costly though, about $300+/week.
Just thought I'd throw it out there as another option.
As for the Christian Preschool, here is a link that tells you more about it. They have a drop in program from 10-11 on Fridays if you want to check it out.
http://www.dobbsferrylutheran.org/content/cps.htm