Hi Deb and welcome (almost) to Dublin. Your choices of hotels will be very dependent on budget. But there are not many that will accommodate 4 adults in a room. It may be worth considering an apartment which can be got for about $300 per night. Oh yeah, Dublin is not cheap

Food wise, we have everything, all areas of the world are well represented but again, not cheap to eat here. A good area with lots of choice is Temple Bar which is in the City Centre. Be careful of hotels/apartments that say they are close to the City, they may be but our public transport isn't exactly of a high standard, and guess what, taxi's aren't cheap!! But it is a great place to visit and I'm sure you'll have a ball!!!
The most popular things to see are Guinness Storehouse, Jameson Distilltery, Trinity College (Book of Kells), national Gallery and Museums, there's more than enough to keep you going for 4 days!! Also have a look at
visitdublin.com lots of info there. We also have the obligatory city pass card which may work well if you plan on visiting a lot of attractions,
www.dublinpass.ie
If you like strolling around and smelling the roses, I'd also suggest Malahide Castle, Powerscourt House & Gardens. Dalkey and Howth are also lovely areas to take a stroll around.
If there's anything you'd like some help on, feel free to PM me or respond to this as I have subscribed to the thread.