Welcome to TOTV, Mike!!! Hope you enjoy your upcoming stay in TV.
Generally, the Lifestyle Preview is a one-time thing.........though depending on the sales person they'll connect you with, you might be able to come back and do another stay at a later date if they feel you're a strong candidate to buy a new home. At least that's the way it worked with us (we declined the offer for a second stay). Others will be able to relate their own experiences which might differ from ours. And any subsequent Preview visits are usually without any of the "perks" that might have come with your initial stay.
As far as coming back for future stays, yes....you can rent a home either directly from the homeowner or through a rental property management company. Another option to consider if your primary purpose on those subsequent visits is to just look around and get a feel for everything in TV would be to stay at one of the hotels that is connected to TV property and is golf cart accessible. Rent a cart (again, from a variety of sources), park it in the hotel's lot at night, and enjoy! Holiday Inn Express and Comfort Suites are two locations located adjacent to Spanish Springs that fill the bill.
Again, welcome to TOTV - and welcome in advance to TV!!!
Bill
p.s. Bring your checkbook! You never know..........you just might end up buying a house!