We did the zip-line tour at Kualoa Ranch and it was unbelievable. Had an absolute blast. Also went to SeaLife Park and swam with seals (my favorite). Went snorkeling at Hanauma Bay. Great place.
Normally I would say spend as much time at Aulani as you can because it's so great, but I have no COVID visiting experience. Under normal circumstances the adult pools, bars, the spa, and rental stuff at the beach are enough to keep you busy and relaxed the whole time!