You can walk in if people are there which is nice, but the campers seem to think you aren’t allowed. Not sure what the discrepancy is since the sign legitimately says walk in access is allowed but privacy of campers is required.
Also there is very little information on the government websites about actually going to visit the tower not just staying in the cabin.
1. Our unlifted Yukon was able to get all the way to the gate.
2. The tower is fenced and locked off. There is no time during the year that it is open since the stairs are deteriorating. However, supposedly you can get up it if you scale the fence.