WDW vet here, with one trip (Feb) under her belt. I agree, schedule beach/touring (and resultantly driving) for busier weekend days. Traffic will be better. Just use Waze (popular map app) and pay attention to travel times before heading out. More of an issue M-F. Driving isn't bad, just trafficy. Much crazier driving in NY. No comparison.
The beaches are awesome. We went to Laguna Beach (Crescent Bay), and enjoyed the tidal pools (including some with kelp that were deep and clear enough to jump into when the tide went up), and sea lion rock...including a baby sea lion rescue, along with the beach itself and the gobs of surfers (fun to watch). We were there in Feb, and needed a dog friendly beach, so along came our 14yo lab. One of my favorite vacay days!
We stayed offsite (needed a place for our dog), and stayed at La Quinta Inn because of their pet policy and recent renovation. It was fine. We walked most of the time. We are DVC renting onsiters or deluxe stayers, and missed staying in the bubble, but the price differences were staggering. If we go again, we will plan way ahead and rent DVC VGC 7+ months in advance. We toured VGC and DLH, and preferred VGC for its themeing and location. I will say that Trader Sams (at DLH) was a favorite spot to hang out in the evening (outside, because of the kids), with live music and tiki torches. Pleased that they are bringing that to WDW!
The other must-do (IMO) is booking the Fantasmic dining package at Blue Bayou. I much preferred F! and POTC at DL, and this combines both! Arrive early to your reservation (and try to book the early side of dinner for first seating), and ask and wait for a water-side table. Everyone loved watching the boats going by, and even got chatty with them, LOL. The area for BB F! seating is the best, and receiving a foam pad to sit upon and having room to stretch out was totally worth it.
Everyone swears by hopping (the parks are crazy close), and we are hoppers at WDW, but given that this was our first time there, we didn't want to leave the park once we were there. Depending on the hours, and party schedule, you may want to add it on later on. For us, we only hopped when DCA closed earlier in the day (as it often does), and headed over (with the masses) to DL.