How long would it take my family of 5 (with a kid in a wheelchair) to walk from the nearest parking lot on the south end of the bridge to a good vantage point (the first tower?) and back again? Is this even doable? Is it a steep walk? We don't have plans to drive over the bridge in our short stay and I think the kids would enjoy this. Biking is not an option, I don't think my 7 year old would fit in a trailer.