Hong Kong has so much going on and there are heaps of options. You will naturally find your own great food no doubt but there is a few suggestions below.
Suggest you buy HK Octopus Card each and add some value - HK$50 deposit is refundable on hand in when you leave. It will be the easiest way to get around without bundles of cash and buying tickets et. Can be used for all subway and airport trains, trams, even taxis plus convenience stores as payment for shopping. You can buy these at HK Airport Information Desk directly in front of exit door in Arrivals Hall. Then you can use for Airport train ($HK90 each way) as well or just take a taxi from airport direct to hotel. https://www.octopus.com.hk/en/consumer/octopus-cards/products/on-loan/standard.html
HK has amazing airport train with downtown checkin centres where you can take you bags, checkin at station, receive your boarding pass and then wander around city all day and head to airport 90-120 mins before flight is due to depart. Great flexibility or just cab from hotel of course but train much quicker at peak times.
Look for a Lei Garden Cantonese Restaurants - excellent quality
My absolute favourite dumpling restaurant is Din Tai Fung dumpling restaurant - yum yum best there is!! Please try if you haven't experienced this brand of Taiwanese restaurants before. Xiao Long Bao are a must. My favourite is in Causeway Bay restaurant but there are two in Kowloon/TST area. Expect to queue at peak times. Look at my Din Tai Fung review here for recommendationshttps://www.foodtravel.life/din-tai-fung.html Restaurant locations are here: https://www.google.com/search?q=din+tai+fung+hong+kong&oq=din+tai+fung+hong+kong&aqs=chrome..69i57j0l5.7207j0j9&sourceid=chrome&ie=UTF-8 Comments here from my foodie friend Kathryn (Seabourn regular) who is in HK at present and loves smart restaurants. (They may make more sense once you are there) "Black Sheep Group. They have 22 designer concept restaurants here. We have only touched surface but Ho Lee Fuk a must, can’t book but put name down and they call you so go around corner to bar called Quinary amazing! ( signature cocktail Earl Grey Caviar Martini). Greek Restaurant Keira ( modern funky with HK view) on Queens Road amazing, then upstairs fabulous outdoor intimate bar amongst skyscrapers. Peninsula Hotel for lunch or Afternoon tea. Drink at Mandarin Oriental. New Rosewood hotel on Kowloon gobsmacking. View at Ritz Carlton Hotel bar great but service mmmm!! 118 floors up for sunset and Hong Kong lights. If they want roast duck Chinese style upmarket Kam’s Roast Goose ( Michelin 1*). Also Francis in Wanchai absolute find small but worth it, a chef, sommelier, front of house owners. Drink at Intercontinental Kowloon one of the best views on harbour. Martini at happy hour at Four Seasons again great."
Look for a Lei Garden Cantonese Restaurants - excellent quality Joel Robuchon has restaurants there if you want European Michelin star Sevva - premium euro restaurant rooftop bar HK Island Best time is early evening into night - another old favourite of mine but been a couple of years since I was there. https://www.sevva.hk/
Harbour City - Huge quality shopping centre cruise harbour at cruise terminal - near Star Ferry terminal
China Club - membership only club with famous authentic old style Shanghai style restaurant on HK island and has a bar on roof in low rise building. Only limited hotel concierges can get you in. Four Seasons can, not sure about others. https://en.wikipedia.org/wiki/China_Club
Premium Hotels: Shangri-La - slightly further along waterfront past Intercontinental but I've never been in Intercontinental( great location and view of HK Island harbour side) or Ritz Carlton (100 floors up) Kowloon side Four Seasons at IFC - amazing club lounge HK Is side Peninsula Hotel Kowloon
General Activities: Peak Train cog train up hill to top of Island for great view. Choose your day of course Harbour City - huge quality shopping centre at cruise terminal - close to Star Ferry wharf Fantastic subway - but always busy Lang Kwai Fong - great trendy restaurant area on Island at night or lunch Star Ferry to cross between TST/Kowloon and Island - use Octopus card Causeway Bay shopping area cool - Star Ferry runs here too from Kowloon side 10 min trip Double decker Trams on HK Island ot even double decker buses to Stanley sitting upstairs at front Take JetCats to Macau from Macau Ferry Terminal- old Portuguese territory- about 1 hour each way. Good for day trip or overnight. Suggest Cotai strip casinos - Sands - Venetian, Pariesienne etc if staying overnight as opposed to original Macau Island IFC Mall under IFC Towers on Island. Quality shopping and Four Seasons Hotel at one end. Great cafe ground floor in Four Seasons Hotel.
Note: TST (Tsim Sha Tsui) is the area harbourside on Southern Kowloon - Hong Kong Island is really Hong Hong