You can use luggage transport, but we usually have a car, and just drive ourselves.
Otherwise, we just arrange to have bags transferred and head to a park. Then hard to new resort when you get text, or about 3-4pm.
The downside of free luggage transfer is that you don't have access to your stuff for a good chunk of the day. Last time we did this, and didn't have a car, we just hopped in a taxi. Price was very reasonable, taxi was very clean and fast.
If we are just staying one night, we don't unpack. Prep one outfit for everyone in advance, plus easy access to pj's, toothbrush/toiletries, and a hairbrush. If possible, don't even open other luggage.
Only other hassle is relocating groceries and chocolate. We avoid groceries, or bring a smaller soft cooler bag. and just use soda cans/water as 'ice' packs. Luggage services will store stuff in fridge, but I don't think luggage transfer transit is quick enough for highly perishable foods.