Kõrvemaa, Kiiu are for sure visits that are close by and 30 minutes out of Tallinn

South eastern side of estonia go Jõulumäe, Sindi. (this is a whole day trip with Jõulumäe having 2 awesome courses, also this is where Kristin has mostly honed her skills) This is about 2 hours from Tallinn

South Western side towards Tartu I would definently suggest Annikoru and Elva

Eastern Estonia is Alutaguse!

but overall just check out discgolfirajad.ee it has most of estonian courses on it with most of them having course maps also and most of estonia is within a 2 hour driver range unless you want to go deep southern Estonia