We spent two days walking along the Circum-Baikal railway, which is between Slyudyanka (1 hour from Irkutsk) and Listvyanka (1 hour from Irkutsk too). There's the track all along the lake, and rocks on the other side. Sometimes there is a kind of valley (like this) with a village and fields, and it looks very pretty. You can also buy veggies and milk from locals. Every two days there's a train with a shop inside, so you can buy everything else there. You can either camp along the Circum-Baikal, or live in one of the tourbases there (quite good quality for about $15-$20 per night).
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