My guiding principle on deciding what is acceptable Sabbath keeping is derived from this quote, "
Every Christian must stand on guard continually, watching every avenue of the soul where Satan might find access. He must pray for divine help and at the same time resolutely resist every inclination to sin. By courage, by faith, by persevering toil, he can conquer. But let him remember that to gain the victory Christ must abide in him and he in Christ (Adventist Home (403.2)).
From
Isaiah 58:13-14, Sabbath keeping should glorify God. When you step out in nature on a Sabbath, there is a chance you could see a lion hunting an antelope and eating it. The only difference (in my opinion) is that the wildlife program on TV is controlled by the director, so, there is a chance you could be exposed to some inappropriate content in-between the programming - which takes me back to guarding the avenues of the soul. In as much as the program may not be bad on its own, there is
need to stay watchful so that the devil may not take advantage of something good to make a bad end out of it.
If you could, please take the time to go through this
article on Sabbath Rest by Ron Preast. It has some valid points to consider. I have also attached an additional article with guiding principles on Sabbath observance.