Just back from July 18th Solstice Alaskan cruise. We had beautiful weather the entire time. Me (48) my husband (55) and son (10). Previously sailed Norwegian, Royal and Disney. This, so far, will go down as our favorite ship. The staff was friendly and accommodating to needs. The ship is beautiful and rarely do you feel crowded. Our son enjoyed the Fun Factory and insisted on taking part in the evening slumber parties (which gave us a chance to enjoy some night life -- yes there was nightlife, way more than on the Disney cruise). Select Dining was nice for us. Never had to wait, but we booked reservations online (which we changed the day of without an issue). Premium drink package likely paid off for hubby, and for me was just nice to not have to sign each time (when I didn't like a drink, I just got another one without hesitation, also had many specialty teas, coffees and waters).
This experience is more along the line of relaxing, educationally entertaining (Brent Nixon and Celebrity Life activities), and fun (cocktails and dancing in the evenings). This is not the rock climbing, character greeting, pumping dance music all day event.
Would recommend: premium alcohol package, reserve excursions online ahead of time, walkie talkies, over the door shoe organizer (not just for shoes), power strip for charging devices, magnetic clips and hooks for walls, lanyards for key cards, dress in layers (we're not talking ski jacket cold here, but bring mittens and knit caps for when on deck), and chewable Dramamine (first night and full day at sea we needed it, the rest smooth sailing). Also, we used small to medium paper bags with handles to store socks and undergarments above bed (think gift bag size).
Would recommend Solstice. The crew was great. Will hope to sail Celebrity again.