One of the nurses at work uses this type of stool when she's charting. She's a big woman so it is very sturdy
Another option might be this type of walker with a seat. Maybe he could ambulate long if he's holding on pushing something then when he tires, he can sit.
Enjoy your cruise. We plan to do our first 12 cruise next year.
Teresa and Larry
#36-Carnival Splendor 9/16/12
7 night Mexican Riviera
#37-Allure of the Seas 11/11/12
7 night Eastern Caribbean
#38-Celebrity Solstice 4/8/13
17 night Tahiti -- Sydney-Honolulu
40th Anniversary Celebration
270 days at see; soon to be 302