We stayed at the Zion River resort (Virgin) last April for roughly 2 weeks. Very much enjoyed the park-like atmosphere. Everything was meticulously CLEAN. The bathrooms, laundry area: spic 'n span. We have a nice RV shower set-up...so pay-showers do not insult us.
Because this entire area is SWAMPED during high season: a gated pool, pay-showers, etc...reflect an effort to control the onslaught of humanity (some not so good) that invade this corner of Utah in season. Any nice meadow along a roadway, WILL sprout tents, bon-fires, impromptu clothslines and pit-toilets.
We no longer travel with kids or pets; however most of the folks camping at this resort had both: no problems. Not a 'senior' park. Only draw-back (for us) was Verizon air-card laptop and cel phones had no reception when in that little river valley. Took the laptop with us into town periodically for lunch and caught up with family e-mails from various restaurants. Directv (satelite) reception was great!
Sorry I cannot speak to Wi-Fi accessibility. As in most parks: reception is probably best inside the office...ha!
Let us all know where you go...ok? Always great to gain fresh perspectives. Cheers!