In your case I would keep the SPH rooms but to relieve your fears there is absolutely nothing wrong with Decks 1 or 2. We have stayed on every passenger deck on the ship on our various 16
DCL cruises and Deck 2 is one of our favorite locations (I prefer Deck 2 as there is one large porthole as compared to Deck 1 which has two smaller portholes).
Maybe this will help....it is a blurb that I post whenever someones is hesitant about staying on Decks 1 or 2.
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The benefits of staying on Deck 2 or Deck 1...putting some misconceptions to rest!.
I can never understand when people say that Deck 2 is far away from everything or that they feel afraid of staying on the lower decks....the opposite is actually correct (at least on DCL)....if you think about the layout of the ship and you are staying on Decks 1 or 2, the only places that you really need to take an elevator to are Decks 9 and 10....except of course if you are in a wheelchair or handicapped in some way (or just don’t like stairs)...but think...you can have that extra dessert if you walk some stairs LOL!!.
Here is a breakdown of decks....
Decks 9 and 10 - Topsiders restaurant, Mickey Pool, Goofy Pool, Adult Pool, the Vista Spa, the fast food places, Cove Café (coffee bar), the Deck Parties, Palo....if you didn’t want to hike up the stairs you can take an elevator to these decks from Deck 2 (hint...the forward elevator is almost always available and takes you right to adult pool area and spa on Deck 9).
Decks 6, 7, 8 - these are passengers decks...no cruise "activities" and you would still have to walk up 2, 3 or 4 flights to the pool deck (Deck 9) or Palo, sports deck (Deck 10).
Deck 5 - has a some passenger cabins and the Oceaneer Club, Oceaneer Lab, Flounders and the Buena Vista movie theater (all these are only 3 flights up from Deck 2).
Deck 4 - has the Walt Disney Theater, Mickey Mates shop, Treasure Ketch shop, Studio Sea lounge, Tea with Wendy event, Shuffle Board, those great comfy Deck chairs outside, the walking/running area, Animator's Palate Dining Room, Shutters (all these are only 2 flights up from Deck 2).
Deck 3 - has Rockin Bar D (theme nights, game shows, comedy shows, nightclub acts, Bingo), Diversions Pub, Sessions Piano Bar, Promenade Lounge, Up Beat shop, Internet Cafe, Guest Services Desk, Shore Excursion Desk, The Atrium (where most of the photos ops are taken and autographs given plus the games like Chip It Golf or Frog Racing, the Captain's Cocktail Party, Martini Tasting, Till We Meet Again Party) Parrot Cay Dining Room, the Galley Tour, Lumiere's Dining Room (and I probably forgot a few activities).... (all these are only one flight up from Deck 2)
Deck 2 - has the new kids area called Ocean Quest (on the Magic) plus passenger cabins - just walk down the hall.
And finally Deck 1 has the Medical Facility and some passenger cabins...(only one deck down).
So, saying that Deck 2 is too low and too far removed from all the activity is not correct at all....it is actually closer to MORE of everything going on onboard except for things that happen on Decks 9 and 10. In addition, Deck 2 is at least equal in distance to some things as if you were staying on Deck 6, not to mention the convenience of getting on and off the ship in ports...no waiting endlessly for the elevator to the higher decks when you come back from a hot, exhausting day of exploring the ports....just one flight up and you are “home”....priceless!!!
DCL has decorated all their passenger cabin hallways in the same fashion. You would not really know if you were stepping off the elevator onto Deck 8 or Deck 1 by the decor so don't think that the lower decks are in any way less desirable than the higher decks. Obviously if you want a veranda you need to get a cabin on the higher decks but if you are happy with an inside or an oceanview, save some money and book on decks 1 or 2. None of the DCL passenger decks are below the water line (which is another misconception of cruising.
I personally love Deck 2 , Cat 9 as they have the huge portholes and I love looking out across the ocean!!!
Good luck with your decision!!