The Grand Hotel on 21st St. has an in house spa, an indoor pool, and is on the boardwalk and oceanfront.
The Clarion, Princess Royale, and Quality Inn Suites on 33rd St. all have pools with glass ceilings.
There are two indoor mini golf courses, one on 68th and one on 136th St. You can head to the boardwalk shops on the weekends and still get Thrasher's Fries and Fisher's Carmelcorn (weather permitting), take a horse drawn carriage ride from the inlet that goes around town, Go shopping at the Tanger Outlets on Rte. 50 in West OC, drive to Assateague and walk the beach and find sea shells. Have a quiet dinner at the Captain's Table on 15th St. inside the Courtyard by Marriott Hotel or watch the sun set over the bay at BJ's on the Water on 75th St. Rent bicycles and ride on the boardwalk. Dandy Don's is open on10th St.
You could visit the Life Saving Station Museum on the boardwalk.............and before you say "ew" on that, it really is unique and fun especially the old tyme bathing suit display on the second floor. Or you could take the historic walking tour of downtown OC. Pick up a pamphlet at the museum or at City Hall or the Convention Center on 40th St. Try Laser Tag at Planet Maze!! That's a lot of fun. I'm over 60 and tried it for the first time a year ago and loved it! Ice skating at the Carousel Hotel indoors!! You don't say how old your daughter is, but if she's over 21, head to Seacrets for a drink and some night life.
Hope that helps you some.