I spent 5 months up there last year, but didn't use a hotel, We were in a motorhome. The price you are quoting is in the ball park with what they charge up there. We did stay in the Best Western in Valdez at $185 per night while our motorhome was being repaired.
As for activities, as you drive into the park there will be signs directing you to where you will need to go for tickets for the bus rides into the park. You will be allowed to drive your vehicle only 13 miles into the park. There will be many viewing stops along the way.
Just inside will be a spot for purchasing tickets for bus rides deeper into Denali. We stayed at Teklanika Campground, which is 29 miles into the park. You will want to take the longest trip you think you can do. There is one that takes 11 hours. This is the best tour available. Remember that the buses are Blue Bird school uses. There are no bathrooms on these buses, but there are rest room stops along the way.
You will be treated to some of the most majestic sites you have ever seen.
I would suggest packing a lunch and snacks for along the way. Ask at the ticket counter, while we were up there, no food or was to be found along the trip.
You must be flying into Anchorage or Fairbanks. Spend some time in what ever town you fly into so you won't need to double back. In Fairbanks, take the Riverboat Discovery tour. Everything is preplanned, but the trip is worth it. If you wish you may include the El Durado gold mine tour. Drive up to University of Alaska, visit the museum and the Musk Ox. Just a short drive dowm from Fairbanks is North Pole, Alaska and Santas Workshop. We stayed at the Santaland campground where the work shop is located. Santa lives there also.
In Anchorage is the native american heritage life center. This is just off the Glenn Highway on your way into Anchorage. If you miss the Musk Ox at the University of Alaska, drive into Palmer, where the Parks & The Glenn Highway merge, go to see the Musk Ox Farm & the Reindeer Farm. Drive out to Lake Hood, right across the road from the airport, and watch the more than 1,000 float planes that take off and land there daily. Ride the trolly, downtown, and see all the sights, then take your car and visit the ones you would like to spend more time at.
Between Denali & Anchorage is Talkeetna, a nice visit fora few hours. Without going back to my notes, that's a short wrapup.
I guess I should mention Seward, this is the closest for taking glacier cruises that I can think of. It's quite a drive from Denali. You could drive out the Seward Highway, from Anchorage, to Portage for their glacier tour. On your way to Portage is Gridwood, turning off there to Alyeska, a lodge along with a ariel tram ride to a wonderful view of Turnagain Arm.
Read my blog on Yahoo 360 for photos and more comments on Alaska.
Enjoy and sorry for writing a book.