I would walk there too the day after tomorrow if I didn't have so many things.
If I didn't have so many things to carry, I'd go there on foot as well the day after tomorrow.
この場合、次のように言うと良いでしょう。
ーI would walk there too the day after tomorrow if I didn't have so many things.
「たくさん荷物がなければ、私も明後日歩いて行くんだけど」
ーIf I didn't have so many things to carry, I'd go there on foot as well the day after tomorrow.
「たくさん荷物がなければ、私も明後日歩いて行くんだけど」
to walk there 「そこに歩いて行く」の代わりに to go there on foot とも言えます。
「明後日」は the day after tomorrow
ご参考まで！
カナダ 
