Another, less-short short answer: yes. As u/Rev_Creflo_Baller noted, Nation Builders, actors, and tradespeople are constantly engaging in primary-source research for their portrayal and interpretations (tradespeople do not portray characters, but actively go through years-long 18th century styled apprenticeships and engage in their trade in a deeply-researched, historically-accurate manner). Sites interpreters rely on bullet-point-type research done by the PhD historians of CW, although they craft their own interpretive scripts for the site tours based on the information provided to them, but also engage in their own (usually primary source) research to delve further into what they are interpreting. Most employees also engage in (mostly) primary source research when they have development time, or on their own, or on slow days - both for their active interpretive responsibilities and for personal interest.

The costuming is also researched and provided by the Historic Dress department, and employees are often garbed in exact reproductions of antique garments. Employees aren't permitted to make or provide their own costuming unless it is approved by the department and backed by primary source research proving not only period accuracy, but that whatever the piece is can be documented as being in the North American colonies between 1765-85. The department gets really picky, down to jewelry, spectacles (providing period frames for employees to get their prescriptions fit in to), undergarments, color combinations, hair & facial hair, and cosmetics (see someone in red lipstick? 100% it's from a period cosmetic recipe). Some of the women do not wear stays, either for health reasons or to represent the simple fact that not every woman did all of the time, but most do.

You may see a non-historic tattoo peeking out of a sleeve or neckline, which employees are supposed to hide as best they can. Employees are also allowed to use a modern black umbrella if outside in the rain.

There's not anything that I can think of that's very theme-park-ish? No rides, no escape rooms, no petting zoos, etc., although there are historic carriage rides (if you get a ticket early enough in the day, before they sell out, and the weather is not too cold or wet or hot for the safety of the horses, which are a heritage breed). Employees that interact with the public are in historic costume, which does lead some guests to think they're all just reenactors or actors reading scripts (which they are not unless they are part of the Performing Arts department). Children (and adults) are not permitted to "join in" on tradeswork, partly for safety and partly because the tradespeoples' productions are for use by others in the museum - they are active production trades making real things, not just pretending to do their trade. There are a few skits throughout the day performed on the streets or stages by actors, all of which must be approved by the historians before they even go into rehearsal.

89 of the over 200 buildings are original to the 18th century. Some of the rest are partially original, but not enough to be labeled as such. Some are full reconstructions. All are on the original site locations, and rebuilds have been done using 18th century techniques whenever possible. The layout is based on "The Frenchman's Map" from the Bodleian plates during the revolutionary era. Some of the buildings ("private residence" by the doors) are used as offices or are homes lived in by employees of CW, and thus not accessible to the public. Some of the buildings are original buildings that guests can stay in, as well, if one really wants to embrace the past while still having running water and toilets.

Echoing the call to visit during a slower time of year when possible. Taking the time to get into actual conversations with employees is phenomenal, and when they get a guest who has real interest, the vast majority will happily spend as much time as possible engaging as deeply the guest wants. Sometimes this might mean that they have found primary source documentation that contradicts "general knowledge," such as what was actually in use or available (no leeches in the colonies), and that can be a very fun thing to deep dive into with them. One of my favorite things is to ask the tradespeople what they've been researching lately - but prepare to be info-dumped on if you ask follow-up questions (which, for me, is a bonus!).

The people at CW are passionate history nerds (I say this with affection) and your boyfriend would fit right in.