This is a rising high school sophomore so I really don’t think it’s too early to familiarize themselves with a college campus. If they don’t want to do a full on tour that’s okay, but I think those are definitely useful at this age, too. I wouldn’t be making a list of colleges to apply to yet, but visits, whether formal or informal, are great, IMO.
@groundhog74 if your daughter is adamantly opposed to visiting a college I wouldn’t push it, but if it works with your vacation plans I would at least walk around a campus or two if she’s even halfway interested or says she doesn’t care.