Addresses and Visitor Information

1. National Aquarium, 14th Street and Constitution Avenue NW, 202-482-2825, http://www.nationalaquarium.com.

Open daily, 9 a.m.-5 p.m. $7, seniors and military $6, ages 2-10 $3, 1 and younger free.

2. Oxon Hill Farm, 6411 Oxon Hill Rd., Oxon Hill, 301-839-1176, http://www.nps.gov/archive/nace/oxhi/visit.htm.

Open daily, 8 a.m.-4:30 p.m. Free. Reservations required for special programs and for popular activities, such as milking cows, gathering eggs and the wagon rides.

3. Watkins Regional Park Nature Center, 301 Watkins Park Dr., Upper Marlboro, 301-218-6702, http://www.pgparks.com/places/parks/watkins.html.

Open Monday-Saturday, 8:30 a.m.-5 p.m.; Sunday, 11 a.m.-4 p.m. Free.

4. Watkins Regional Park, Chesapeake Carousel, 301 Watkins Park Dr., Upper Marlboro, 301-218-6757, http://www.pgparks.com/places/parks/watkins.html#carousel.

Fall hours: Open weekends only in September, 10 a.m.-7 p.m., and for special events. $1.25 for residents of Prince George's and Montgomery counties (proof required), nonresidents $1.50.

5. Radio & Television Museum, 2608 Mitchellville Rd., Bowie, 301-390-1020, http://www.radiohistory.org.

Open Friday, 10 a.m.-5 p.m.; Saturday-Sunday, 1-5 p.m. Free.

6. Vaccaro's, 222 Albemarle St., Baltimore, 410-685-4905, http://www.vaccarospastry.com.

Open Monday, 9 a.m.-10 p.m.; Tuesday-Thursday and Sunday, 9 a.m.-11 p.m.; Friday-Saturday, 9 a.m.-1 a.m.