If you do want to go out of Stockton, I can't think of any Hotels right next to the ramp. There are some that are close by like the Marriot Courtyard which is about a mile or so away from Riverpoint Landing.
Snug Harbor and Viera's are nice, but the only problem is that to get to the heart of the Delta, you have to go all the way around via Three Mile Slough or Georgianna Slough. This is a bit of a long trip and in the late afternoon the San Joaquin and Sacramento Rivers get really rough so you don't want to be caught out there. But you could stay at Viera's and launch at one of the many ramps on the Delta Loop as that is only a couple miles away.
Or you could stay on the Delta Loop at BW Resort which has some one bedroom cabins starting at $110 per night. Not sure what your budget is for this trip, but if it is a little tight, then I would stay at Viera's for $75 a night and put in at a place like BW. BW has a decent ramp. I have launched there before.
From there, your options are endless. For one day you could head West via the False River and explore Bethel Island taking in food and drink at one of the many establishments along Piper Slough. Sugar Barge and Rusty Porthole offer a nice view of Frank's Tract and are favorites of boaters. But whatever you do, don't take the temptation to cut across Frank's Tract as there are a number of snags in there that you want to avoid. Many who know the Delta have no problem riding on Frank's Tract but I would not want your first experience to be a bad one, so it's best to just stay off it.
After that you can head East via Roosevelt Cut, Old River and Connection Slough to Mildred Island. Mildred is a flooded island where many boats like to anchor out. You can enter at the northeast corner and exit at the Southwest.
Now you can head East once again on Empire Cut and turn left on Turner Cut. You can stop at Tiki Lagoon or Turner Cut for more water or continue on. You will soon come to a fork. Take a left if you want to stop in for a drink and view some scantilly clad women at Lost Isle or you can take a right and continue on. In either case you will want to move south on the San Joaquin towards Stockton taking a left on Fourteen Mile Slough. When you come to the "T", take a right on Fourteen Mile Slough and follow it all the way to Village West Marina. You can then have lunch at Garlic Brothers which is a great place to eat and have a few drinks. Before you leave, check your fuel tank and see if you need gas. Village West has some of the best prices on the Delta. Not much more than what you pay at most gas stations in town, so if you need gas, this is the place to get it.
Moving on from there, go back on Fourteen Mile Slough only this time instead of heading back to the San Joaquin, keep heading north. Unless of course you want to see more of the scantilly clad women at Lost Isle, then you would take a left and head back there. Take a left on Disappointment Slough, take a right up Honker Cut, veer left on White Slough, then right on Potato Slough until you come to Tower Park. You can stop there or take a left after the bridge and head back to BW.
Not sure how fast you will be going or what you will be doing, but with the exception of Piper Slough, there aren't many long slow speed zones on this route. So potentially you could do this whole route with some time left over. If that's the case, feel free to explore some of the many sloughs or whatever looks interesting to you. Just keep the map handy.
When you get back to BW, reward yourself by driving into Rio Vista with a nice dinner at Foster's Big Horn. I wouldn't recommend taking the boat to rio Vista as the wind will be howling late in the afternoon making for an unpleasant ride. But if you just can't get enough of the water, then keep heading over past BW to Moore's Riverboat on the Delta Loop before you pull the boat out for the day.
This is just an example of what you could do and I'm sure others will add their thoughts and you can go from there.