Thanks for the suggestions. Since we will be there for 7 days, we prefer to spend the 2 days out of NY for some variety. To be honest, none of the more popular day trip options appear to be must-dos for us. We are seldom impressed with waterfalls. Do hope that Niagara falls are majestic enough. It's good to hear that the long day trip to Niagara falls include other stops. I think we are okay with the long bus ride. It starts off at 4am and we will probably be sleeping for most of the time. For day trips to Philly and DC, we will probably just go with DC as fellow forumer also recommends.
How about restaurants in NY?
So far, I made reservations at Fraunces Tavern and Grand Central Oyster Bar. Also planned to visit Katz's Delicatessen, Ellen Star Dust and The Original Soup Kitchen. If Blue Box Café reopens, we will try to make a reservation too. We are not into fine dining but are interested in iconic restaurants and cafes.