We are planning a trip to the San Diego zoo with an almost 4-year-old and I can’t decide if I should bring a stroller. I have read that it is a lot of walking and hills, but I have also read you can use the aerial tram, buses, moving sidewalks, etc to avoid some of the uphill walks. She doesn’t use a stroller at home. Would bringing a stroller be more trouble than it is worth? Thanks!