Visiting groups should bring plenty of change. Food and drink is not allowed in the visitor center, but several picnic areas are available. Groups, especially those with children, should take care to ensure that no litter has been left behind. Safety is very important. The weather at Promontory varies considerably from cities such as Salt Lake City and Ogden, please check local forecasts so you can be prepared.
Mosquitoes can be quite bad at times.
You are encouraged to bring repellent.