I almost got that wrong too during my primary training. I made one stop for
fuel, but at the second airport I'd planned to do a touch and go (as I'd
done on my training XCs and my two practice solo XCs). I hadn't reviewed the
appropriate regulation, and my instructor didn't catch the problem either
during the pre-flight briefing. Luckily, for some reason, the tower was only
able to accommodate full-stop landings at the time.

Well, mine was two and a half years ago... don't think it really matters
anymore. And come to think of it, I never made a full-stop at a towered
field either... so I don't know how to talk to ground (and haven't flown
out of/landed at a towered field since the long XC in my training).