Many non-birders visit Monteverde NP in Costa Rica to see a quetzal. While queuing up to buy a ticket, there was one clearly visible in the trees across the parking lot. When I pointed this out to people they didn't want to know about it because they weren't in the park yet and had not yet paid $15
Some people I talked to later were disappointed that after paying $15 they didn't see one in the park.
Regarding Bittern, Minsmere RSPB is a great place to see them in the spring.