Barbara, a chara,
It would be lovely to meet you but unfortunately, I won't be able at that time. Please do keep me posted as to how your trip went though!
To help you plan your adventure, please find below a quick guide to Boyd sites (click on the links to find more information about each location)...
ORIENTATION
Your Boyds hailed from the district between the village of Croghan and Carrick-on-Shannon (Co. Roscommon). In between these two is a district known as Drumlion (which was known as a "half-parish"). Drumlion is where your Boyds attended church and were interred (which suggests the original point of origin. I believe Hugh Boyd came out of Legvoy aka Gardenstown in Drumlion and came into Ballinvilla by way of his marriage to Anne Barrett).
CIVIL PARISHES
Drumlion is part of the civil parish of Killukin Boyle (not the other Killukin). Your Boyds, through marriage, spread west into the civil parish of Killummod, and northwards into the civil parish of Tumna. (It's a good idea to join and post your message all three civil parishes IMHO).
See if you can pick up a copy of the book
1. CARRICK-ON-SHANNON
The Boyds were "gentlemen farmers" aka graziers, middlemen aka landlord's agents, and Cess Payers (which meant they qualified to sit on the Boyle Grand Jury and also the Carrick on Shannon Workhouse Board of Guardians.
This means that you might want to take in a tour of Carrick-on-Shannon to include the Carrick Local History Centre, the Workhouse attic, "Douglas Boyd - Victualler" (a Ballinvilla Boyd started trading here in the early 20th century) the old Courthouse and the pubs they took a drink in ... Cryan's and the Oarsman Bar. All before they crossed the Bridge they took home (newly built in 1845).
The Ballinvilla Boyds would have brought their herds to market here and also had a butchers shop on Bridge Street in Carrick-on-Shannon (in the 19th century) which is this light-blue building here next door to Bank of Ireland. Next door, was the merchant's store and bar (always a bar back then) of Anne Barrett's kinsman, Patrick Barrett Esq. (either her brother or nephew TBC). P. Barrett & Co. was a big deal in the latter half of the 19th century... the largest merchants in the west. Emigration tickets were purchased there.
Just before you cross the Bridge you will find on your left the Carrick on Shannon Tourist Information Office (also a Barrett holding at one time) which will guide you to Drumlion, Croghan and more. Also, try and connect in with the Carrick-on-Shannon Heritage Group before you arrive. They may have Boyd records. By the way, locally everyone refers to this town as "Carrick". So... off to Carrick with ye!
2. DRUMLION
Taking the R360 west out of Carrick, you will find the New Drumlion Cemetery. Here you will find at least three 20th century Boyd Headstones for the Boyds of Cashel (also your people, see William Boyd (1850-) & Kate Killilea of Tawlaght House). For online headstone photos, see IGPweb.
In St. Michael's Church DRUMLION (just south-west of Carrick-on-Shannon) you will find a Ballinvilla Boyd stained glass window sponsored by James Boyd Jr of Ballinvilla (grandson of Hugh Boyd & Anne Barrett) in memory of his father James Boyd Sr of Ballinvilla (brother of your ancestor, Thomas Boyd).
3. BALLINVILLA
Here is the Google Map point for the old farmyard of Hugh Boyd & Anne Barrett. Their original house (mapped in the first OS of 1839) was perpendicular to the old building you see here with the red corrugated iron roof. I can't tell if it is still extant (refurbished) or has been replaced.
See also Derrylow CROGHAN - home of Andrew Boyd in 1857, just north of Ballinvilla.
Heading west from there you will find the quaint cemetery of Killapoge which was the old burial ground of the Barretts (and other Boyd kin).
4. CROGHAN
The neighbouring village of Croghan had the most famous cattle fair in the west. Croghan Carnival was a big event at this time. The Ballinvilla Boyds played for the Croghan Shannon Gaels GAA club and were All-Ireland Gaelic football celebrities in the 1940s. You will find the oldest Catholic (and protestant) headstones in the Holy Trinity Church graveyard on your way into the village.
5. SPRINGFIELD, CASHEL & TAWLAGHT
The road that leads you east out of Croghan back towards Carrick [R370] was all Boyd & Killilea country. Check out the big Georgian farmhouses of Boyds of Springfield aka Cuiltyconneen, and the Boyds of Cashel. You might also like to take a gander at the Carrick-on-Shannon Golf Course and Woodbrook House (formerly Hughestown house) ... because in the 1830s the Boyd family of Knockadrehid (civil parish of Ardcarn) acted as agents for the Mulloy of Hughestown estate.
Check out the Boyd ancestral townlands of:
Legvoy aka Gardenstown CASHELL - home of Thomas Boyd and Patrick Boyd in 1857, just north of Drumlion.
Tawlaght CASHELL - home of Patrick Boyd in 1857, just east of Legvoy.
Cuiltyconeen (aka Springfield) - home of Douglas Boyd in 1857, along with Cloongownagh to the north, Sroankeeragh to the south (home of Thomas Boyd in 1857) and Tumna to the east (home of William Boyd in 1857).
You have a lot to go on there. (No need to take it all in, Ballinvilla may suffice!)
If you have any specific logistic questions about your visit, please email Jane at jhalloranryan@irelandxo.com. For general questions on the family history, I will do my best to reply here.
All the best!