I am planning a trip with my mom and my brother and was wondering if a reasonable budget of $500-$700 is reasonable for 2 nights/3 days? Preferably which would be the minimum budget for trip like this? We plan to see most of the monuments which are mostly free such as the Washington and Lincoln monuments. Maybe we would go into the Smithsonian and would really like to visit the Arlington Cemetery. We are not looking for an upscale hotel, but one that is in a safe neighborhood that we would be able to go outside and walk around. We would be driving from Upstate New York down to D.C. Any help would be appreciated.