i have always stayed on site--have stayed at all three and they all have good features.
Grand Californian is very elegant--you can look out over downtown disney or dca
Paradise Pier--has private entrance to dca--you can look right into the park--you can use DL pools but it is quite a jaunt--the farthest from the monorail
DL Hotel--has great pool and is the closest to the monorail station at downtown disney
Here is a list of the other things you can do at DL Hotel
cove pools and beach
Take pleasure in a real seashore experience, where the entire family can enjoy:
Two shapely pools
A sandy beach for play
A volleyball court for friendly competition or just foolin' around
A delightful playground for kids of all ages
Disney Character cut-outs for the perfect photo opportunity
fantasy waters show
Grab the moment memories are made of. This treasured Disney classic has brought awe-inspired wonder to families for over three decades.
1800 choreographed water-jet fountains reflect the power and the beat of the beloved soundtrack
100s of synchronized lights
Classic Disney musical favorites
Koi Ponds
Commune with nature as you walk over the wooden bridge and encircle this calm, beautiful pond.
Over 200 brilliantly colored Japanese koi fish
Streaming water with glorious garden flourishes
Special feeding times
Never Land Pool (if you stay at PP you can also use this pool but it is quite a walk!)
Only Disney could provide a pool with this much character and fun. Inspired by the adventures of Peter Pan, the 5,000-square-foot paradise allows the entire family to:
Scramble through a cavern on the way to the wondrous 100-foot waterslide
Climb a stupendous stairway into the Misty Mountains of Never Land
Swing from the Hangman's Tree on the shore near Captain Hook's Pirate ship
Relax in a steamy hot tub beside Skull Rock
Admire the teepees of the Indian Village high atop a hill
Remote Controlled Jungle Cruise Boats
Take a miniature safari adventure as you pilot replicas of
Disneyland® park's famous Jungle Cruise boats.
Choose from 20 boats, including Senegal Steve, Lualaba Lottie and Rwanda Rod
Ride under a quivering rope bridge with its disgruntled gorilla
Travel through the roaring Diswaytada Falls area
Scenic Waterfalls
There is nothing like both the power and the peacefulness of a waterfall. Explore this oasis of tropical foliage, beautiful waterfalls and mysterious caves.
Feel the revitalizing mists unique to a natural wonder
Hear the roar of pure force and free-flowing waters
Enjoy the colorful lighting as it transforms the water into a brilliant showplace after dark
Team Mickey's Workout Room
Maintain your healthy lifestyle at this state-of-the-art fitness center.
Exercise bikes and treadmills
TV monitors
Weight machines
Free weights
Massage chair
i have heard good things about the Candy Cane Inn about a 10 minute (?) walk but have no personal knowledge.