The National Aquarium in Baltimore is a great, kid-friendly experience with fish, sharks, jellyfish, outdoor wetlands, a tropics house, and more! While you're there, you may also enjoy grabbing a bite at one of the local restaurants and taking in the best views of the harbor with a scenic walk along the Baltimore Promenade to the Maryland Science Center and the East Harbor Marina. (This is about a 1 hour drive from the Best Western Westminster.)
If this is your first time to Maryland, you may be interested in taking a trip to our nation's capital to see the iconic monuments (Washington, Jefferson, Lincoln, etc.), the Smithsonian Museums (Natural History, American History, Air & Space, etc.), the Capitol, and the U. S. Botanic Garden. Getting to the National Mall and the Tidal Basin is a bit of a longer trek from the hotel (~1h 20m), but for those who have not been to D.C., it definitely won't disappoint!
If you would like to visit a cute, little, historic town with iconic hiking, look no further than Harpers Ferry, WV! Harpers Ferry features a plethora of recommended attractions including rafting, shop-hopping on High Street, and hiking (recommended hiking trails can be browsed at: https://www.alltrails.com/us/west-virginia/harpers-ferry). This location is an approximately 1 hour drive, westbound, from the Best Western Westminster.