When you want to encourage someone to explore what's inside, the phrase "take a look inside" may seem a bit repetitive. Luckily, there are plenty of synonyms to choose from. Try "check out," "examine," or "inspect" as variations. Or, consider urging someone to "explore," "investigate," or "peer." Other options include "observe," "scrutinize," "survey," or "probe." Each of these phrases can capture the sense of curiosity and excitement that comes with looking inside and discovering something new. So get creative and choose the synonym that best fits your tone and intention.