Just getting to Mt. Rigi, does NOT require reservations. One nice routing is: boat from Lucerne (GERMAN: Luzern) Vitznau, then train up to Rigi Kulm. [The trains "meet" the boat, so you won't have to wait for the train.] Rigi should have snow even into April--but weather patterns are very unpredictable.]
Thanks nrr. I was worried I booked a weird time of year and things close down for a month or so.