Yes, aside from Neopets rules, giving anyone, even someone you trust your log in information is never a good idea.
Just as a side note story, way back in the days where I played Everquest, I remember when a person left a very high end game content guild. He and the guild leader had been friends, so the guild leader had his password. The guild leader turned around, took or destroyed any items the person had gained through the guild, and then de-leveled his character from the max down to the bottom as "pay back" for him leaving them.
Bottom line, giving account information is always a bad bad bad idea. Look at what a "friend" did to a "friend."
Do try alternatives, logging on at a friends house, or even a library as suggested. When cleaning out your internet history, make sure to clean out the offline content too. That clutters things up and slows you down. Keep your information safe and good luck!