可以说 "Please keep your valuables safe."
这句话来源于英语日常生活中对防止贵重物品丢失或被偷的提醒。
下面是一些例句：
Please keep your valuables in the hotel safe. (请把你的贵重物品放在酒店保险箱里)
Please keep your wallet and phone safe in your pocket. (请把钱包和手机放在口袋里以防丢失)
Keep your jewelry and passport safe at all times. (随时保管好你的珠宝和护照)