I will be in the Alsace region for about 5 days with a family of 4. Are there any sort of travel passes you can buy for "unlimited" train and bus travel in the region, or is it all just pay as you go?
You might want to check out this page for the passes that are offered: https://www.ter.sncf.com/grand-est/tarifs-cartes/tarifs-regionaux
Not sure if there is an English option, but I just used Google Translate to change it to English.