D.,
Many schools and churches offer pre-school. Generally 3-4 year olds attend for 2-3 hours 2-5 times per week. Some "daycares" also offer pre-school programs. My kids attend Kindercare, and it offers a pre-school curriculum, I believe you can enroll your child for just the preschool portion, a few days a week (or as many as you would like).
Here is a link that describes all the different pre-school methodologies
http://michigan.gov/greatstart/0,1607,7-197-27385-83422--...
You can also go to the State of Michigan child care lookup and put in cities or zips and pull up all licensed facilities. Once you click on a school-- it will let you know if it is a full time daycare provider or a pre-school only. The link is
http://www.dleg.state.mi.us/brs_cdc/sr_lfl.asp
Really- while my son (now 4) learns letters, phonics, numbers, and other "skills" pre-school is really for social interaction and fun. I would look for someplace close to home that has caring teachers.
Good luck.