MARK TWAIN MUSEUM: 208 Hill St., Hannibal, Mo.; www.marktwainmuseum.org or (573) 221-9010. Museum is open 9 a.m. to 5 p.m. daily in April, from 8 a.m. to 5 p.m. in May, and from 8 a.m. to 6 p.m. June through August. Adults, $6; children 6 to 12, $3. The replica of the Tom Blankenship home is scheduled to be completed this summer.