Need some suggestions.

Corning Glass Museum,
Washington DC,
White House,
Niagara Falls,
Goat Island,
Capital Hill,
Lincoln Memorial,
Watkins Glen State Park,
Cavern Cascade,
I want to see all of these places after my day trip from vegas and this will be really having such a good and this will be alluring time for me. But i need to know how many days will be enough for me to be there.

Alayaka, First of all, I would like to say that you have selected really nice places to try to get a good time. All of these are versatile places of East Coast USA and will offer you a great time. I think 5 to 6 days will be enough to explore all of these places of different regions to get a remarkable time.

I am happy that you like to share here your mind with me and would be really helpful as you had bee suggested me such things. I would be really happy to have such a mind blowing time for me to be there.

Alayaka...! I would say that you have choose really interesting places for having enjoyment. I also enjoyed myself while i was visiting this kind of places. so I want to share here the names of some most fabulous fun things which you can enjoy at this awesome place like:

hiking
walking
climbing
skywalk
horseback riding
photography
rafting
kayaking
surfing