If you're just walking, you can probably walk as far as you want. I'd say, there isn't a "too far" unless you start getting dizzy, or your heartrate gets too high, or you get dehydrated.

Aww thank you finally an answer ya just walking... I'll bring my cell and a water I dont know usually since I got pregnant my excercise was swimming because its san diego we're still having warm weather but today is really cool and cloudy which is awkward but the perfect time to take advantage.... Thanks so muc
<3 jess

Much*

No problem have fun!

Yup, just remember walk as far as you want..Just remember you do have to walk back hehe